Chainsaw engine question : LUSENET : Junkyard Wars : One Thread

I have tossed around the idea of taking a chainsaw engine and mating it to a little foot powered scooter. I know there are companies that already make these, but I figured it would cost half as much, and be twice as fun. What will I need to do this besides a foot scooter and the chainsaw engine? Will a 2.2 ci. (36cc) have enough power to work? What would be the easiest most reliable power delivery method to the drive wheel? I have everything pretty much worked out except the transfer of power to the rear wheel. Any help would be appreciated. Also, I would like to use readily available parts.



-- Joe Eickhoff (, April 10, 2001


I'm no expert...but I would think that a small engine would do fine. I would mount a soft roller skate wheel (or a wide rubber wheel from the hardware store) to the engine. Then mount the engine on a pivot over the rear scooter wheel (engine rotating to the back of the scooter) with a sring that keeps it about an inch away. Mount a footplate to the top front of the engine. When you want to go, press down with the heel of your foot and hit the gas. (Wear a helmet!)

On the other side of the engine pivot, I would put a version of the typical "fender brake". When you need to brake press down with your toe.

If your email is correct, I will send you a sketch...meanwhile, I'm sure a dozen people will say..."no, no, this" (draw, draw, draw)...

This is a great place for ideas.

-- Dan Denney (, April 10, 2001.

Ooh! Ooh! I know this one! Pick me! If you don't mind using a push scooter with larger wheels (12"), it's a piece of cake: Use a 12" rear bicycle wheel with a cog on it, replace the chain saw's cutting chain with a standard bicycle chain and add a throttle cable up to the handlebars. (Bolt the chainsaw, minus the cutting bar, to the rear of the scoot's footboard.) And don't forget to CHECK THE BRAKES! Ya-Hooooooooo!

-- Chip Haynes (, April 11, 2001.

I typed in the wrong email is my correct one. I like the idea of using the bicycle setup. The only obstacle is attaching a sprocket to the chainsaw, and finding a chain of the correct size.

-- Joe Eickhoff (, April 11, 2001.

I have actually been thinking about attaching a chainsaw engine to 1 of my mountain bikes. I don't know if it has enough power to turn the large wheel? Can anyone help me? Anyway I figure if you can get a sprockt that is about an inch shorter than the rear wheel and make a longer rear axle it would work. Mount the engine right ahead of the rear wheel and add a bicycle brake set.Watch out it will accelerate like crazy! Top speed may not be what was desired though.

-- Dallas Shelp (, December 27, 2001.


I was just thinking this morning about mounting a chainsaw engine to a multi-speed bicycle. I was first thinking a regular bike, with derailleur, etc - but then I started thinking about using a 3-speed bike (I have always wondered how they worked - I think they use a planetary gear system like an automatic transmission does) - then I started wondering if I could build a chainsaw engine powered recumbant "vehicle"...

You should be able to mount a chain to the sprocket attached to the centrifigal clutch on the chainsaw engine (I believe chainsaw "chain", ie, bladed chain, is the same pitch, etc as bike chain) - if not, find a busted multispeed bike and pull the sprocket assembly apart on the back wheel, and use the smalled sprocket - you will probably need to weld it to the clutch casing or attached sprocket.

If you want to keep pedaling, simply add another large sprocket to the front pedal area - you might need to extend the pedals out a bit.

My idea was to build a chainsaw engine powered vehicle, and not have pedal power at all - just a larger gas tank...

-- Andrew Ayers (, January 22, 2002.

This is more of a commentary then an answer, but I took a tiny girls bike (the "Giant Puddin'") and mounted a Homelite Super 2 on the crossmember right in front of the seat. I then machined a new clutchbell so I could mount a 17 tooth bike sprocket to it. This is because while the chainsaw chain pitch may be the same as bike chain, the sprocket is not compatable. Also, my previous attempts to braze a tiny sprocket from a copy machine had ruined the temper of the bell and made it wear away too fast. Anyway, I punched out the roller bearing from the stock bell and pressed it into the machined Al one and it works. The bike chain from the bell then goes to the crank, where I put a 34 tooth sprocket. On the otherside of the crank I put a 17 tooth sprocket which then goes to the 16" wheel via a 10" road bike sprocket. While unnecessarily complex, it does produce a top speed of 31.7 mph, I think it has some more left but I need a longer straight stretch of road. The total gear reduction is around 9:1, something like 11-12:1 would be better. The engine is around 30cc (2ci?) It gets a little squirrly around 25 mph though. good luck stan

-- Stan Beebe (, March 26, 2002.

I built an entire scooter from scratch with angle iorn and bolts. i first used a small toro weedeater motor at about 8 to1 ratio driveing an 8 inch wheel using the stock clutch. i then built a jack shaft so i had 16 to 1 ratio. this is all belt driven by the way. i tried it out again but the clutch sliped to much. i by passed the clutch and clocked out at about 9 mph. it had no hill climbing abillity. i bolted a homelite in and that helped alot. it maxed at about 15. i am now putting a 61 cc mculla chainsaw on it . it likes a rollout of about 14inches per revoultion of the motor. the clucth stock will work fine. go with a go kart rear wheel, dont use the stupid friction drive idea. dont use belt. chain only

-- Larboc foo (, April 29, 2002.

I came across this page because I was searching for answers about chain sizes. It turn out Iím doing the same thing you guys are doing. I have a snow blower motor welded it the frame of my mountain bike. I went to hook up the chain and the sprocket off the clutch teeth wont work with the sprocket off the bike. The chain wonít work. Well I post some pictures and the web address when Iím done.

-- Josh Barveld (, May 28, 2002.

As to the above go for a chainsaw motor.. and use a direct drive system for power.. chain... I am currently going to put a chainsaw motor on a scooter.. and can anyone tell me if they have done it and what problems they came across. Does the shaft that spins the cog on motor bend under pressure. And how do you build a supercharger for a chainsawmotor thanks help appreciated....

-- George (, June 05, 2002.

I used a scooter from Wal-mart($39) with the 12" tires. I replaced the rear tire with a similar one from a 12" childs bike being it already had a sprocket on. First I tried a 30cc chain saw with a small sprocket welded on the clutch bell along with a 17 tooth sprocket welded on the small tire sprocket. It was geared way too high. I found a small (fist sized) gearbox from a pitney bowes coalator with a 16:1 ratio. The primary side is belt driven with a idler pulley which is spring loaded(forcing tension on the belt). Secondary side HAS to be chain driven as I tried a belt setup and found that they will ALWAYS slip. I swapped motors and now use a 29cc leaf blower motor (clutch on the chainsaw can't handle the load.) Chain alignment and tension is very critical. My 13 year old son knocks the chain off at least twice a day and am now thinking about using a belt and sprockets similar to a timing belt on a car. Top speed is about 20 mph and it makes it up all the hills around here. After much experimenting I believe that with the 12" tires the best ratio is about 17:1. Have plans on a 40+ cc motor with some sort of wide timing belt. Plan on spending many hours!

-- Ray Mercer (, June 06, 2002.

has any one used a lawnmower engine if so I woul be interested to hear. As to the above what do you mean that the chainsaw clutch couldn't handle the load how so??

-- georg (, June 07, 2002.

I am currently building a chain saw bike. I purchased a bicycle disk hub from an online bike supplier. You can see what it looks like : 1107&sku=2996 I had a wheel and spokes added at a local bike shop. I then mounted a 72 tooth #35 sprocket where the disk would normally mount. I had an adapter machined to fit onto my chainsaw crankshaft and then installed a standard go kart centriugal clutch. I am in the process of attaching a jackshaft to achieve the correct gear ratio. This is my second chainsaw bike and much more costly. Good luck!

-- K.J.Kreiter (, June 11, 2002.

I came across this page looking for a way to hook a weedeater motor to a razor scooter. as for the cahinsaw scooter i think you need a custom racing clutch and sproket from racing go-carts they will hold up to over 80 horsepower and will not wear down i hope this helped and if anyone has any anwers to my delema e-mail me at

-- josh (, June 30, 2002.

just keep in mind that what ever you decide to do, keep with a rollout of around 14 inches per revoultion for larger engines and 12 inches per revoultion for smaller engines. most smaller chainsaws and all weedeater motor clutches will not grab the clutch bell tight enough to use the full potentiall of the motor. if using a weedeater motor you should just use a direct drive motor. i would also use chain only on the wheel sproket to jackshaft and a small belt from the motor to the jackshaft. another thought is to use a shaft drive. good luck all.

-- larboc foo (, July 07, 2002.

about the guy wanting to use a lawnmower engine. these motors are built to run with the shaft pointing up and down. if you turn them so the shaft sticks horizontily oil will not get to the piston and will ruin the motor the only exxeption are two-stroke engines (i.e lawn boys)

-- larboc foo (, July 07, 2002.

Just wanted to post a little something - kinda an update. It has been a while since I have done anything with my bike, but I decided to go electric, instead of engine powered. The reasons behind why I am doing it this way are many, but mainly it is noise (little with an electric motor), and wanting to have a challenge (while it is challenging to mount an engine to a bike, no doubt, it is more challenging to get a motor to do the job). So far I have built my frame, in a recumbent fashion, from two bikes (a women's 26 inch 10 speed and a girl's 20 inch BMX). I am still in the process of mounting a motor (I have the motor, but I haven't did much since moving into a new home, so it has taken me a while to find time). The motor I have is a 90 VDC PM motor, with a 1/2" shaft. My drive sprocket is a 9 tooth ANSI #40 1/2 inch pitch sprocket, with 1/2 inch bore, that I had face-ground at a machine shop to fit the 10 speed chain (10 speed chain is thinner than BMX chain - both are 1/2 inch pitch, though) - know that #40 sprockets will work, but need to be professionally ground to preserve temper and fit the chain. If you go to a bearing/belt/chain supplier, they will have #40 parts - this is standard industrial size chain - but the width is pretty wide, so the grinding is necessary. Don't ask for bike chain or sprockets, they won't have what you want, and will look at you funny. Bike stores likewise will not have the right part for mounting on shafts. There is an online store called "Tulsa Engine Warehouse" that sells these same style sprockets, pre-ground and everything - but they cost more than buying just the sprocket and having it ground (I managed to get mine done free at the shop). I will post again as the project goes on, and I have pictures that I will post on my site.

-- Andrew L. Ayers (, July 31, 2002.

I am building a motorized mountain bike. I have an old homelite pressure washer motor on it and I am thinking of friction drive. Can anybody show me some of their plans? I was thinking of mounting the motor on the back of the bike, then attaching a pully to the clutchbell. Then, I would have another pulley on the friction roller and drive it like that. Is this idea ok? or would chain drive be better. Any suggetions you have would help. Thanks.

-- cRaSh-N-bUrN (, September 08, 2002.

do you want to sell me the pressure washer pump? i have been looking for one for along time. is it the one of the 2 strokes? personaly i wouldnt go friction drive. you wont be happy with it. allthough i have never heard of the belt idea, it sound like a very good one

-- paul dice (, September 12, 2002.

I am doing the same thing-I have a BMX bike that I mounted a bracked to the seatpost that holds a chainsaw. The saw is upright and I welded a 2nd gear steel sprocked to the outside of the saw's centrifugal clutch. The chain then leads down to the rear wheel, then over to the pedals(I cut off the pedals and put 3" bolts so I could get it going, and be able to get my legs out of the way while the front sprocket was spinning.) It works great but I was cutting a path for the chain and cut into the gas tank- My only advice is making SURE that ALL of the angles on the chain are the same or it will work its way off the drive system-GOOD LUCK

-- Shawn NeVille (, November 24, 2002.

Me and my mate mounted a chainsaw to a kids' bike. There's pics at .

We removed the clutch, welded a trick nut to the clutch nut, and screwed that onto the driveshaft. We deflated the wheel slightly, attached the engine with many bolts and bits of box section, and attached a throttle control (bike brake lever) to the handlebars. We kept the front brake. The compression dump lever (the one you flick to start the engine) is attached to a piece of wire. Start the bike with the compression off, then you pull the wire once the bike is moving to give more compression and hence more power. It works well, we used a trick nut with a very nice texture and it's quite grippy. Unless of course it's wet, then it doesn't grip.

We could cover the roller with a rubber sleeve, that might give more grip in the dry, but will definitely slip a lot more in the wet.

I'm going to put some more pics up on the site today.

-- Anthony Smith (Team Grecet) (bleeding underscore me underscore 2000, December 23, 2002.

Make that


-- Anthony Smith (, December 23, 2002.

yes it certainly will have enough power to propell you with a little friendly push to get it going from you.i built one out of a 25cc wipper snipper engine and it works fine it actually goes pretty quick.The easiest way to drive it would be to remove the cluth and go down to your local machine shop and get them to make you a knurled shaft which would run directly on the rear wheel but make sure when you have it made that you can install a support bearing on the other end so it doesn't snap off your crank shaft.

-- glenn bastarache (jjmarse@hot, February 10, 2003.

Nevermind those answers. Go with your 36CC engine and since your using a razor style scooter i would ise a spindle drive sysem (friction). if you want more info and a look at almost a hundres homemade scooters go here: ilook at the messae board for tons of info. dont foret to look in the homemade scooter section too for almost 100 scooters. Youll find TONS of info. Thanx.

-- Simon Conway (, February 11, 2003.

If you want better preformance go with a chain and sproket. A belt creats more friction on parts because it needes to be tight to work. It will also make heat if not tight enough the clutch is already hot enough as it is from sliping,and it will slip. if you go with a chainsaw motor you will have to put a new sproket on. A CHAINSAW SPROKET WILL NOT FIT A BIKE CHAIN. A chainsaw sproket has groves in it and a normal chain sproket has spikes. So you will have to improvise. A chainsaw runs at higher a RPM than most weed wacker motors. So it is better. You can mount a chainsaw on a bracket shaped like a rectangle, made out of angle iron, with two self centering ball bearings on one end and the saw on the other.

chainsaw##### bearings angle iron rectangle frame

the chainsaw is pointing with the W where the clutch is and the saw bar, the thing that the chain normaly rides on, shown as ####, you don't want the chain to rub on the bar. the bar gets mounted to the angle iron. DON'T use the hole bar 3 inches past the frame will do.

# #00 # is the bar, looking down it the long # 0 way the rectangle frame too, IT NEEDS 0 TO BE MOUNTED THIS WAY! 0 IS THE MOUNT ^^^^^^^^^^^ ^ is the angle iron this mounting system is better because you can tighten the chain like you would on the chain saw normaly. Bearing is where the bearing is. put a rubber wheel on a shaft, shaft diamiter based on inside diamiter of bearing, it should be a snug fit. then mount a sproket to that shaft, out side the bearing. Number 41 chain will work on bike sproket but the best setup. then mount on bike it can be front wheel drive or rear wheel drive.

-- andy matus (, February 20, 2003.

Hey my friend is thinking about making one and he doesn't know how. can you send me a sketch please? greatly appreciated! thx

-- eric peterson (, March 07, 2003.

i am looking at building a chainsaw bike but i have know i dea on how to do it so if any one could give me some advice on how to do it it would be greatly appreciated

-- joshua marcom (, March 11, 2003.

"most reliable power delivery method to the drive wheel"

-Chain- you get the most power - but it may be a lot harder to make

-V-belt - easy to make - slips & loss of power

- friction wheel - easy-est to make - more reliable - some loss of power

"I have everything pretty much worked out except the transfer of power to the rear wheel"

same here

I have some weed eater motors and chain saw motors and want to make a motorized bike - but I need to now how to gear it - if you can stop a weed eater with you hand how is it going to power a bike - I know it works but I need more info - one place said I would have to get up to 18mph before it would work - thats more than a little hard to do on a gravel road - and what about hills - any web sites with - how to pages - thanks

-- will (astro_van_1985@yahOO.cOm), March 11, 2003.

I tried to make a bike with a weed eater motor - with a direct drive setup - friction wheel - and never was able to get it started - my guess is that the bike wheel is not spinning fast enough to start the motor - I think I need to use a smaller wheel - might use the motor and mount on a scooter

Next will be a chainsaw motor with the clutch and chain drive - I hope that works

-- will (astro_van_1985@yahOO.cOm), March 18, 2003.

im currently building a chainsaw engine powered remote control car, the last one i built used a strimmer engine, but it had no clutch so it didn't go very well, i now intende to use a chainsaw as they have more power and a clutch a dont intend to stand on it so i think the clutch will be up to it

-- Andy b (, March 18, 2003.

how do i put a chainsaw motor on a 15 speed mt bike what do i need to do it

-- robert marden (, March 29, 2003.

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-- huppy puppy (, April 13, 2003.

yea, verily yea, everyone needs either giant rear sprokets or major gear reduction of of the engine. power edgers have a big built-in drop-like a power of 6:1 or so. with an off-engine number like that, a 12" tire mounter with mountain bike sprokets is all ya need, so here's a parts list:

-a lot of time -a 12" weel get-up -a ganked mtn bike sproket -a weedeater edger at about 25cc's (or go for gold w/50-60cc's of chainsaw and have fun rigging a gear reduce) -a frame to your liking (can cut and bolt and mod. that 12" bike you stole the tire from) -a good sense of humor -talents in the ancient african art of ghetto rigging

-- will (, April 15, 2003.

i have a moutain bike and want to put a weed wacker motor on it. if anyone has plans send them to me ASAP.

-- david (, April 17, 2003.

i have an almost full size moutain bike. if i put a weed wacker or blower engion in it how fast will i go?

-- david (, April 18, 2003.

p.s. what modifications will need to be made to the motor.

keep in mind i dont know how to weld and im not paying lots for someone to weld 4 me.

-- david (, April 18, 2003.

p.s. i dont know how to weld but what modifications will need to be made to the motor.

-- david (, April 18, 2003.

Check out Tzi's Scooter World. This is a very cool web site about home-built motor scooters.

-- C.Young (, April 19, 2003.

i got the engion ready for mounting on my bike and boy is it loud even with a muffler(thats good). Anyway, the engions throttle uses a plastic lever. i need suggestions in how to hook up this engion throttle.

put any ideas below

-- david (, April 21, 2003.

walmart has throttle control assemblies for push mowers that'll probably do your trick

-- will (, April 21, 2003.

i hooked up a cable throttle and am using the front brake lever but can't figure out how to convert a lever motion witch is now reversed to a cabel (pulling)motion. since the motor is backward i cant puth the cable through the motor. the only other thing i can think of is get a longer cable and string it around the engion.

if anyone has any tips put them below. thanks

-- david (, April 21, 2003.

how fast might a 21.2cc mcculloch leaf blower engion go?

-- david (, April 26, 2003.

i have been working on an old 12 inch tire scooter that i put a trimmer motor on and it would pull me at 25 mph of flat terrain , i put a 9 tooth on the clutch and an 50 tooth on the wheel, i need to have a larger sprocket on the rear though, this set up work ok for the little ones under 70 pounds but me at 175 pounds i would have to push it off, well we finally wore the bronze bushing out of the clutch as it would never really get a good bite, it always slipped on me, so i am now thinking about changeing the clutch setup with a riding mower type system useing pulleys, a small pully on the motor and a large one on the wheel and oversized belt and a third pulley for tension to take the slack out of the belt when u want to take offi dont know how this will work yet, another clutch method would be to put the engine on a pivot and be able to raise and lower the engine onto the tire for the drive it would have to be spindle drivin and u could not ride it when the road is wet... keep on tinkering

-- jeff (, April 26, 2003.

but im not using any gears or pullys i am using a friction drive (easy).i mounted a bike peg to my 21.2cc mccolloch leaf blower engion. so how fast would that go? p.s. i dont have a clutch on the engion. to stop i mounted a kill switch and was wondering will that stop me really fast when i kill the motor or will i come to a smooth stop?

also if i pull the prake lever and slow too much will that kill the engion?

will i be able to stop at all with the engion running?

-- david (, April 27, 2003.

hey im a 14 year old aussie kid and the way i did mine is put a skate bourd wheel on a wipper snipper motor and made up a bracket for it and welded it on my 12' scooter so it is like direct drive the motor has a clutch on it i set up the carby cable to a brake lever for my throtle

send me some pics of your projects

-- john jones (, April 30, 2003.

i have hooked upthe motor. i mounted a bike peg to the drive shaft and used a friction drive system(with no clutch). i still can't hook up the throttle yet.

if anyone could answer any of the following questions below it would help me alot.

1)how fast might i go (mcculloch 23.2cc leaf blower engion)?

2)how would i hook up a cable throttle to the lever system that the engion has on it now?

put answers bellow thanks!!

-- david (, May 05, 2003.

to hook up a throttle to your gas motor, just find an old gear shift lever from a 10 speed bike that has a solid cable. mount the lever next to the hand grip on the handle bar close enough so you can use your thumb to activate the throttle. the solid cable allows you to push up or pull down without the cable flexing. you won't even need a return spring. push up the lever, more gas ,push down the lever less gas. the carb butterfly will have a spring that will close the gas if you let go of it . i put a 31cc gas edger motor on an extreme scooter with full suspension that has 12 inch tires. i mounted an axel peg to the crank shaft, use a friction drive set up. i also changed the intake to a rear reed valve set up, this set up allows the engine to reach higher rpm. i mounted a hp exhaust and a hp carberator. i also added a rocket key in the fly wheel to advance timing. THIS IS ONE FAST HOMEMADE SCOOTER. it starts super easy and the ride is smooth because of the full suspension. I have 4 boys and they all have store bought scooters of various types. we all like my homie the best because it is fast and way cool and i made it for less than $200.00

-- james lewis (, May 07, 2003.

I have been working on my scooter for quite soem time now, and I have the solution to changing the sprocket out fromt he chainsaw. I have the CNC commands available to anyone who wants them for 1$. These commands are very simple, and can be given to any machine shop to produce the perfect sprocket to mount on the back wheel. If anyone wants the codes, email me and I will send them to you. The sprocket is 1/4" thick, 7 1/2" wide, and has 40 teeth. I am currently working on the plans for a 50 toothed sprocket which will greatly increase power. This particular one pulls me (150lbs) at 30mph (scary shit), and can climb hills quite nicely.

Mounting your engine to the frame is tricky, and varies depending on your scooter, so I couldnt help you there.

-- Denis J Calarco (, May 08, 2003.

Opps, they wont cost you anything, sorry bout that.

-- Denis J Calarco (, May 08, 2003.

i took a weed whacker motor and a 20" huffy bicycle and im trying to make a something of it. I have a rearend out of an old garden tractor and a transmission too. its all chain drive but i had to gear it down twice to make the thing go... i hope havent got it together yet... i would use a clutch like a garden tractor has like an idler pulley to hold tension on a belt somewhere in the works it doesnt have to be the last thing it can be attached from the motor to a gear box of some sort. just a thought

thanks george

-- george (, May 08, 2003.

just put the motor on the back of your scooter and get a bike chain that is small enough to go around the rear wheel and back to the motor but big enough to rotate. I did some thing like that befor I put a weed eater motor on my little brothers bmx and made it go about 15 mph thats not fast but it works and you do not have to pedal.

-- kevin (, May 09, 2003.

thanks, i'll try the shifter

but i would still prefer a squeeze grip throttle so if anyone can help me on that put your answers below.

-- David (, May 11, 2003.

it is scooter season

-- will (, May 12, 2003.

I used a Husky chainsaw and attached it to a bike. I think I did something wrong because when I started the chainsaw, the bike went backwards. The bike went out of control and the chainsaw came loose off the bike. I think the duct tape did not hold. Anyways the chainsaw chain also sliced up my sisters weiner dog kind of bad. I am not allowed in the garage.

-- Chuck Farley (, May 12, 2003.

i just took the muffler off of my mcculloch 21.2cc blower/vac that is on my bike and i got lots more power out of the engion.

what caused this?

i thought if taking the muffler off of the engion would increse power there must be a different muffler i can put on my engion to increse the power without all the complaints from neighbors.

is there a power increseing muffler that i can put on my motor that will keep noise to a min.?

put answers below

-- david (, May 12, 2003.

I dont want to write my answer below. Anyway, Ive just welded a big sprocket onto the rear wheel sprocket, and put a little sprocket on the shaft coming out my motor. David, I cant help you anymore, youve got to do something for yourself now. OK! ;)

-- david, please...... (donthave1!, May 14, 2003.

i set up everything this is the only thing left and the FIRST problem i had on this problem so BACK OFF.

-- david (, May 16, 2003.

i have hooked upthe motor. i mounted a bike peg to the drive shaft and used a friction drive system(with no clutch). i still can't hook up the throttle yet. if anyone could answer any of the question below it would help me alot.

1)how would i hook up a cable throttle to the lever system that the engion has on it now?


-- david (, May 19, 2003.

Iam currently making a motorised scooter an school. Iam just wonderin if anyone has any ways of helping me out by sending me diagrams and steps of how to make one. All i really need to do is attach a motor to the scooter but wot sort how do i do it i want to know help will b greatly appreciated.

-- mark (, May 26, 2003.

i'm making a wipper snipper powerd bike with a few of my friends and i was wondering if anyone could tell me how to make a direct drive system and friction wheel. i would also like to know how to mount it onto a 16" kids bike. please send me some answers thanks.

-- mitch (, May 26, 2003.

hi every one, just browsing your site and found it interesting because ive been trying to do somethink like that for about two years now, but still havent made one yet because im having trouble with the drive system, can any one help me or if ou have any diagrams could you send them to me as they will help me im using a strimmer engine which is about 24cc and i have a selection of scooters and bikes etc. THANK YOU

-- Danny Stubbs (, May 30, 2003.

hi again if anyone has any engines for sale (working or not)can you please email me s im interested in buying them. THANK YOU

-- Danny Stubbs (, May 30, 2003.

i hooked up a twist grip throttle to my motor and when i turn it it sticks on high. i know i need a return spring but am not sure how to hook it up.


-- david (, May 31, 2003.

Is it possible to put a 31cc weed eater engine on a skate board?

-- Glenn (, June 01, 2003.

yes a big skate board

-- david (, June 01, 2003.

It's Just an ordanary Skate Board.

-- Glenn (, June 01, 2003.

I was wondering if anyone knows how to mount a 31cc weed eater engine on a skate board

-- Glenn (, June 01, 2003.

i was wondering if a 1.5hp edger engine would be enough horse power to power a bike.

-- Glenn (, June 01, 2003.

Well... I have built things from go-karts to weed eater powered rc boats and even a 4-wheeler from a honda 110 motor and axle. I'm about to do the same thing as you, the rear drive is always a pain! The motor should be fine, you can go to and find a drive hub for a go-kart for your rear tire. you might have to modify the width of the rear frame on the scooter to accept the tire and hub width. The setup is about 30.00 and it has a tire, rim, and sprocket all in one set up for a 3/4" axle! Once your hub is mounted, just mount the motor and connect a 11 to 14 tooth sprocket (for a #35 chain)to the clutch bell on the motor. Also at northern tool, a twist throttle(like most motorcycles & 4-wheelers) is only 10.00! This throttle has a 3/4" bore that fits over 99% of handle bars. One other thing...My sons battery powered 4-wheeler died. I used the same hub I talked about here and a 3/4" axle to replace the electric motors and plastic tires in the back. then mounted a weed eater motor in the same manner and it goes about 15mph! I also purchased a brake drum for the rear axle from northern tool and it works great! Under the seat where the battery pack was, I installed a mini-bike gas tank (1.5 gal.). this thing runs forever on a tank of gas! I hope this info help some out there!

-- brian (, June 02, 2003.

Thanks that help alot. I have one of those battery powerd big foot kids car and I did what you said and it works great.

-- Glenn (, June 02, 2003.

me and a friend are trying to build a go-cart out of this $60 peddle car we found at a toy sore, using a chainsaw engine. first off if we were using a 46cc chainsaw, would that have enough power to push a person that weighs about 180lbs up a small hill.. and what kind of gears would be neccisary in order to make this work...

-- anthony (, June 02, 2003.

i am anthonys friend(above), and i was wondering instead of a chainsaw eng. we use a gas blower, and if that could possibly be enough... even enough to just push us forward.. a responce would be appreciated...

-- michael (, June 03, 2003.

A gas blower might be enough, but I think I would run the chain saw if the weight will be over 50-60 lbs (with driver). The chainsaw clutch might be a little weak, might have to reverse the shoes inside the clutch to grab better. Most centrif. clutches are adjustable this way for a soft or hard lockup. Hope this helps!

-- brian (, June 04, 2003.

I got a go kart frame in nice condition but with no brakes and no throtle cable.If anyone is interested in buying it email me at

-- Glenn (, June 04, 2003.

hi my names elliot and im going to get my old skooter like i think its like 40 years old im only 14 and im going to get the hub out of an old wimens bike and stick the sprocket from the pedal part on to the hub and stick that on the motor then just leave a normal back wheel or if i can a mountain bike back wheel around 12"-14" will this work and i am also going to see if i can work the motor wile im at skool cus thats where im modifying the big sprocket to fit i also want to stick a new air filter maybe on of the oil breather filters of a car on there and a new exaust probally make it in metal work the motor i am using is a ryobi grass hornet i think it has a clutch in it if it does will the motor stall whne i stop or will it just ingage and just slip the way i think it works is as the speed builds up the bits inside the clutch spin out and grip thanx plz reply

-- elliot d (, June 06, 2003.

hi, I had thought of the idea of taking one of my old chainsaws and mounting it to an older bike of mine. I just got fdinished reading the whole forum and its made me understand a little better. but one thing, A bicycle chain will not fit the sprocket on the chainsaw? So i cant basically take apart the chainsaw run the bicycle chain to the same sprocket and there we go? If this does not work what is the easiest way possible to achieve this then?

-- Bob (, June 07, 2003.

i hooked up a twist grip throttle to my motor and when i turn it it sticks on high. i know i need a return spring but am not sure how to hook it up.


-- david (, June 10, 2003.

hi every1, im thinkin of puttin a strimmer engine onto a bike frame but dont know whether it has enough power to pull me. do any of you know if it would. please email me on

-- Danny Stubbs (, June 11, 2003.

david (key board 100) you need to drill and hole on the part that twist and a bit on the part that doesnt turn about 2-3 cm apart and put a thread in the hole put 2 bolts in and put a spring on the bolts and it should turn back if you think about it its not hard thats an easy way i no it doesnt say exactly how but its ruf idea on how to do it just think and you will figure it out

-- elliot (, June 13, 2003.

hey could someone please give me some plains for a weed wacker engine on a bike i would really appercate it thanks...

-- scott (, June 13, 2003.

hi everyone has anyone got any pictures or plans of anythink they have built. could you please email them to me. THANK YOU

-- Danny Stubbs (, June 14, 2003.

I have a strimmer engine and a mountain bike. How do I put them together????

-- magnus lockwood (, June 14, 2003.

i don't know wenk wenk

-- wenckle de denkle (wenkle de denkle@wenk.nenk), June 14, 2003.

hello im an australian boy aged 16 me and my mate decided one day to make a motorised scooter so we got a sthil 070 chainsaw motor and a 16 inch scooter and adapted it by using bike chains and sprokets using about a 4.72-1 gear ratio with an 11 tooth sproket on the chainsaw and a 52 on the wheel it works quite well but still needs some minor ajustments but at the moment it still dose 100 kph easy so we r laughing.

-- adrian dixon (, June 25, 2003.

hey, im making a scooter using a chainsaw motor but i am having troubles figuring out how to change the gear thing on the chainsaw so it fits a bike chain, if anyone can help it would be appreciated

-- A.J. (, June 28, 2003.

I think i have a solution. Taking the clutch off and chopping the sprocket off and welding on a new one. Can anyone tell me how the hell do u take the clutch off?!

-- A.J. (, June 29, 2003.

what do you mean by drilling holes in the twist grip throttle

-- David (, June 29, 2003.

I am in the process of building a chainsaw powered BMX using a RYOBI 53cc saw motor. So far I have welded a plate to the bottom bar of the A-section of the frame, after removing the top section. I have the saw facing forward as this will have it rotating in the saw direction as the rear wheel needs to turn. My next step is to remove the clutch and fit sprocket from another back wheel. then cut the cluster from a road bike and mount it on the frame under the saw do that I can then put a second chain from the cluster to a sproket on the crankshaft (which has the pedals removed. I am using the crank sporket from a second crankshaft to then run a third chain back to the rear wheel. Hopefully I will be able to get the right ratio so that it will travel at about 50kph and I will get a motorbike throttle to make controling the revs easier, as the handel bars are the same diameter. Will try to get some pictures together so that anyone who is interested can see what I am doing. Will post the web site that has them as soon as they are available.

-- Glen Manewell (, July 04, 2003.

howdy howdy all im from australia and the only problem im having is tracking down a rear wheel but i have a 14 tooth sprocket for the motor and a 44 tooth procket for the wheel no i weed to know is it easy to pull a mountain bike wheel apart because thats were the 14 tooth sprocket is and then is it possible to use a wheel barrow or a trolley like the ones used for moving boxes and things the wheels off them as they are pump up and they have 4 bolts in them with i can attach the sprocket to but they are $40 and i dont have that but i have 2 12 inch rims but they are not thick enough to drill holes and bolt on to it could i mig weld the sprocket onto the rim or will it fall apart and can some one answer my quetion please ive answered some one elses

-- elliot (, July 06, 2003.

i would appreciate any plans sent to my e mail im trying to build a weed eater powered one and i need ideas also would like plans for a chainsaw powered one anything would be appreciated

-- tawrin verrett (, July 08, 2003.

i am almost donee my scooter, all i need is to bolt the engine on, i made a bracket for it but i need to add spacers to add tention on the chain and i need to weld the sprocket to the outside of the existing gear on the clutch. it was a bit to big so i grinded the teeth down a bit using a grinder and spinning it like a lath with a drill... but fuckin shit i just found out that my chainsaw motor wont start!!!!! GRRR .. im gunna take it to the small engine place soon so hopefully i can get it fixed, but if neone has ideas why it wont start or how i can fix it it would be appreciated! good luck to all u fellow builders

-- AJ (, July 08, 2003.

hi every one, instead of building a petrol engine scooter im going to try building an electric bike or scooter, i know theres already things like this but its more fun if you build it yourself. i can get all of the bits from an internet site that i have found, the good bit about it all is there really cheap.

-- Danny Stubbs (, July 09, 2003.

I hooked up a twist grip throttle to my motor and when i turn it it sticks.

The twist grip works smoothly untill I hook in the cable. so, I know the cable is the proplem but I don't see how to fix this.

help me anyone ^_^

-- David (, July 14, 2003.

Ok, this website doens't explain a lot but pictures talk too

-- psycho mike (, July 15, 2003.

gonna try the same thing myself,if i figure anything out that will help,i'll ket ya know. oh! keyboard,about your cable stickin! if theres no knob. on one end,pull the cable out of the sleeve. straighten any bends or kinks, and clean off any rust oil it and put it back. i do this all the time.

-- e e gill (, July 18, 2003.

AJ... About the chainsaw motor not starting, the spark plug foul out really easily and the plug connector gets corroded too. The carbs ae very simple to take apart! Just make sure to blow compressed air through all of the ports. And finally, take off the muffler and use a propane torch to burn out the carbon build-up on the spark arrestor screen inside the muffler!!! This is the most common overlooked problem with chainsaws. Also for the chain tension, you can just use an extra sproket on a lever to adjust the tension like on a Honda ATC 3 wheeler chain! So when the chain streches, just adjust up the slack. Hope this helps!

To Danny: The idea about the electric scooter is a good one. The power wheels 4 wheeler I converted to a gas motor was scrapped! Too much for my kids to do on their own! I just pulled the weed eater motor and put in a chevy 350 starter motor. Then added a 12 volt battery for a lawn tractor. About 20 min. of run time, and the kids dont have to mess with a gas motor. The top speed is about 15mph. All you have to do is take off the front housing off the starter and install a sproket and weld it on. Best of all, at a junk yard, a starter is only about 10.00. This is awsome for kids to keep it running, just show them how to hook up the battery charger and thats it! Feel free to email me with any questions. just got done with building a 4-wheeler from scratch, actually looks like one too! I can send pics if anyone wants to build one, I solved suspension, steering, and other problems that would save you time. Hope this info help some out there. E-Mail:

-- brian lindley (, July 20, 2003.

hey this is joe and im wanting to put this craftsman 46cc chainsaw motor on a go kart. what mods would i have to put in the engine . will that power a gocart? help would be appretiated thanks

ps would a bike or a scotter be a better idea ? please help thanks

-- Joe Vowell (, July 20, 2003.

Hey... I wouldn't think it would have enough power for a gokart. A scooter or bike would be alot better. Also, a little secret I'll let go of.... Go to your local metal scrap yard("Tacoma Scrap Metals" or "American Recyclers" where I'm at) and look through their piles of crap!!! People throw away a ton of small motors from weedeaters & chainsaws to push mowers to outboard motors all the time. You can find side shaft 5hp gokart motors with a bad sparkplug or broken pull start, or a chainsaw with a fouled plug or clogged carb! Some are quick and easy fixes, and best of all, it only costs a few bucks for scrap metal cost! My briggs and stratton 5HP on my go-kart was only 2.00. I fixed the pull start cord and it runs great! Its usually rich people who throw away this stuff and go buy a new one when it breaks! Their loss is our gain!!!!! Good luck... Cut, Weld, and RIDE!:)

-- brian lindley (, July 21, 2003.


-- Joe Vowell (, July 21, 2003.

Hi, I just got an old weed eater and have taken off the shaft. I REALLY need some help on putting it on a 12 inch push scooter. E- mail me ASAP if u can help or have any plans or advice.

-- Taylor (, July 22, 2003.

If the scooter will accept a 12" kids bike rim, I'd use that. That way you would have a sprocket aleady on the rim. then just weld a small sprocket to the motor shaft and your set! The prev. posts here explain alot. Just look through them and you will find some good tips from people. Hope this helps!

-- brian lindley (, July 22, 2003.

Just had another thought... I saw a gas scooter a while back and remembered it had a slick tire on the back(no tread) and the crankshaft of the motor ran directly on the tire. The motor hinged so the crankshaft would pivot and apply pressure directly onto the tire, no chain or drive belt. The only brake was on the front tire and to start it, you just pushed the scooter a few feet and it started right up. It was a good design, but with out a chutch, the motor would die when you came to a stop, so I guess running a clutch would be a good idea, so the clutch shaft would ride on th etire instead. Here is a web page to check out too(really cool!).

-- brian lindley (, July 23, 2003.

How fast should my weed eater scooter top out at full speed? And if the rear gear is smaller won't that makee the wheel turn faster? Just wondering.

-- Taylor (, July 25, 2003.

The weedeater motor's speed depends on its size. It should go between 15 and 25mph. You want a smaller sprocket on the motor, and a bigger one on the tire. If you reverse this(smaller on the tire), the motor wont have enough power to start out. Basically, you set it up just like a motorcycle, gokart, OR ATV, for example; a 14-18 tooth on the motor, and a 60 to 80 tooth on the axle. Hope this helps.

-- brian lindley (, July 26, 2003.

my 21.2cc mccolloch leaf blower engion which is in great shape started acting up yesterday. i checked the spark plug because it sounded like it is misfiring.

how do i fix this?

-- david (, July 26, 2003.

i dont know it this is what you want, but, i used a 42cc weed eater engine to build mine. i simply took off the shaft and put on a blade from an industrial exhaust fan. i mounted it on an old parcel carrier over the rear wheel. just dont forget to put a screen around the blade.... it goes like hell

-- Tommy Jamieson (, July 26, 2003.

I've got a question. Im planning on welding together a mini-bike frame and attaching a 2hp, 109cc briggs and straton edger engine. I was wondering how fast it would go with an aluminum frame and a 14 tooth sproket on the engine and a 65 on the rear wheel? If you have any other info please tell me more. Thank You

-- matas pacevicius (, July 29, 2003.

I am going to mount a 32cc chainsaw motor onto a 16" BMX style back and have everything worked out except for the engine sprocket and clutch. Would just remove the old clutch from the motor and then weld a newclutch that has the right size sprocket onto the old on or do I need to take the old one completely off. I was told that the stock clutch on the chainsaw motor would slip and that I should get one made for a mini bike.


-- Donnie Greene (, July 30, 2003.

i looked at this site hoping that it would tell me how to attach a wipper snipper/edger motor to my razor foot scooter. yes and no. i dont know any of that mechanical propeties that it has and my dad never uses it. could someone please email me about all that stuff speaking in english no mechanical language.

i had a plan to weld a bike seatpole+seat onto the base of the scooter and have the motor under neath with mesh covering it but i wasnt sure what would happen to it if i was riding it home in the rain. thanx agan


-- Sean (, July 31, 2003.

Does anyone have some steps of how to put a weed wacker motor on theier steps they could email me and what you would need.(other than motor.

-- Matt Brush (, July 31, 2003.

i mean on a mountain bike

-- Matt Brush (, July 31, 2003.

im been thinking about building a go kart out of a vertical shaft motor. does any one now were i can get or make a clutch assembely? does any one now how to turbo charge a gokart motor? if any one has decent gokart plans theyll share thank you

-- john doe (, August 02, 2003.

im sorrry thats mine above i mean horazontal

-- john doe (, August 06, 2003.

my 21.2cc mccolloch leaf blower engion, which is in great shape started acting up yesterday so i took it apart and claned the piston. when i put it back together the engion kept freezing and i would have to turn the motor in the opposite direction by hand to unfreeze it. why is this happening?

-- David (, August 07, 2003.

Been a while since iv put up a message but i got it goin! it does about 40km/h. havnt actually got my dad to follow me in the car yet but that would be my guess, i was havin some troubles with the chain falling off cause the motor wasnt mounted very good. but the things lots of fun, already drove it to my gfs house and work befor.

-- A.J. (, August 10, 2003.

Just wanted to let everyone here know that I now have pictures up of my progress. It has been a long time coming. My website URL is - once you get there, select "Projects", agree to the disclaimer, then select the "EV Recumbent" link. I haven't done to much on it as of late, because I have been involved in other projects, but it is something I am gradually completing (and I figure if I can overhaul my site after so long, then I can do anything - heheh)...

-- Andrew Ayers (, August 14, 2003.

A.J. do you go to high school south?

if so its david from music theory.


-- David (, August 15, 2003.

hi every1 its me again, ive just had this crazy idea of building a small robot and entering the tv programme 'robot wars'.

-- Danny Stubbs (, August 20, 2003. if your engine is jaming make sure all your bearing on the crank shaft etc are all greased and spray the cylender and piston with wd40 (water repelling lubrican it a spray can) if it still james some thing is bent and i have 3 motors i can use 2 are the same basically one is for scrap to get bits for the other and the other is on that is not working yet but is a little but tough and revs more type of motor but ill use the other one its a ryobi wead eater cya

-- elliot (, August 22, 2003.

a 36cc engine will be plenty. The heavy duty gopeds only use 33cc!

-- zac rishel (, August 26, 2003.

thanks but i got another free engion

-- david (, August 29, 2003.

I was also thinking of building a chainsaw powered bicycle.Could someone please send me some plans including the required Horsepower and torque to RPM ratio. I want to be able to mount the engine over the back tire.Actually, it doesnt have to be a chainsaw engine, but it would be convenient to use on original chainsaw chain, remove the guard and attach a sprocket on the left side.i would also like to know how big the gear will have to be on the back wheel so that it doesnt stall while going up hills. I have a 21 speed mountain bike with wheels about 24 inches. Some other questions are, do chainsaws have some kind of a variable clutch, would i be able to pop start it and how would i stop it from dieing when i want to gun it and try to accel fast. Also would i want a 2 or 4 stroke. I would like to be able to detach the chain and pedal if i were to run out of gas.

-- George Furey (, September 03, 2003.

What is the optimum amount of torque: cc's or c.i. and power: kW or Horsepower

-- George Furey (, September 03, 2003.

get bike and attatch a motor of a chainsaw or a wiper sniper and attatch it on the back above the wheel and if i were a fisherman i would capture your heart!!! James and Stefan Rule!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

-- bill ka doodoo (, September 07, 2003.

i wanted to ask about electric homemade scooters. lots of guys i know have built bikes and stuff with electric power assist and they use any kind of electric .. all the way to powersaw motors.. but they all use big bulky batteries.. like cars batteries and they puit like six or seven of them together just to get the things going!!!! so why is it that you must have a battery that has a high amapage any sort of voltage.. why not just use a transformer or something.. and convert the amage to a higher grade and then the voltage would be the same.. or have i totally gone off the mark here.. anybody help?

-- balal arif (, September 07, 2003.

Hi I was wondering how do you get the clutch off the chainsaw? I already have the nut off, I just can't pull it off, are their any tricks?

Very much appreciated.

-- Kris (, September 07, 2003.

i want to know in detail how to attach a whipper snipper motor to a small bike please tell me i really want to know how and stuff answering that guys question answer mine PLEASE!!! James is cool!!! and so r u if u answer thank you

-- bill ka doodoo (, September 08, 2003.

if i attached a whipper snipper engine to a small bike how fast do u think it could "crank" up 2? dont send answer to my website just write on the on where on now please answer if not your a fag!

-- bill ka doodoo (, September 08, 2003.

Back again...... About the question regarding the electric bike/scooter, a 12vdc starter motor from a car or truck works great. Just find a starter with a 1/2" shaft so a 12 to 14 tooth sprocket will bolt right up. A local electronics store will have a variable voltage switch to control the speed of the motor. As for the power source, a large motorcycle battery is ok, but a riding lawnmower battery is better. It is about half the size of a small car battery and you can purchase them up to 500 cranking amps. This would give you about 30min. of run time. Next post is for bigger motors using a ac/dc conv. Hope this helps!

-- brian (, September 08, 2003.

Continuing from last post.... The other idea I saw here was also a good one! If you would use a ac/dc converter to bring 12vdc to 120vac you could run an AC motor and possibly get more power and run time. A good AC electric motor to use would be one out of an electric garage door opener. The main point is to get a small motor with a ton of torque(horsepower isnt that important in electric motors driving a pesonal craft). You need alot of torque to get it moving. Another option would be a 120vac winch motor. Even a lower RPM motor is ok, you just have to gear it right. You could also use a 120vac starter motor for Tecumseh 10-12hp snowblowers(check out, might be a few listed). These snowblowers use a 120vac to plug in a snowblower in climates extreemly cold(like Alaska/ Northern Canada). One last thing, a Chevrolet alternator is self contained and could be hooked up to the drive wheel to help recharge some of the power consumption, this might extend your run time between battery charges. Hope this helps some people out there. Feel free to email me if anyone might want some ideas, sometimes I have good ones, sometimes bad ones, just never know!

-- brian (, September 08, 2003.

are you telling me brian that i an actually do tis and it wont really affect performance? would the use of a transformer mean that itll last longer?..

-- balal arif (, September 09, 2003.

I recently built a bike mounted with a 21 cc chain saw engine. It is extremely ghetto but runs. We used an old mountain bike. We bolted two 20 inch rims 2gether and had a serpentine belt go around 1 rim. We apoxied a pully made of 1 inch oak dowle with some washers on the end to the fly wheel. The bike has slow excelleraion because of its low torgue but can reach 20 mph. Once the pully gets worn down a little and grooved up by the belt it gets more torgue. We also made an air ram for the carborater. We recently found a 5 horsepwer 2 cycle lawn boy lawnmower engine. We are working on makeing another bike. This method is easy and involves no welding or finding exact parts..if u need more info u can im me in my aim name MaFra88

-- Matt xcvx (, September 21, 2003.

hey there peeps .. does any of you guys know how to do gearing on a chainsaw powered bicycle?

-- billy joel (, September 23, 2003.

Hey. I am from Australia, and I am thinking of putting together a BMX bike with some sort of petrol motor. I am just wondering though, what sort of engine works the best, and also how to attach. Are there kits for this type of project? Any detailed instructions or pictures would be greatly appreciated. I'll send you some pics when I finish it.............Any reponses can be sent to my email.....Thanks!!!!

-- Mark........ (, September 25, 2003.

I've actually had many people that I cant use a high powered chainsaw motor on a bike.I really just want to ask how you would go about extending the clutch to the handle bar.I'm not planning on peddling my bike so I'm going to saw off the pedals and replace them withstanding bars. I also would like to know how I would mount the engine to the bike and to what part of the bike I should mount it to. ANYONE PLEASE ANSWER ME,I NEED HELP!!!!!

-- Curt Scott Kanitz (, September 27, 2003.

hey ive got a small bike (like 12" wheels) and im gunna chuck a 22cc weadeater engine on it using a chain and a decent size sprocket 4 tha wheel. managed to get hold of a grip twist throttle which shall b good. how big a sprocket should i use 4 tha back wheel? if ne1 needs grip twist throttle kits (including: throttle, 135cm cable, and two grips) just go to and type in "bike throttle cable grip" (these will all ship internationally). Im also gunna grab 1 of them bike speedometres so i can check how fast it goes, shall b good. if ne1's got ne suggestions plz email me.

-- steve (, September 29, 2003.

if ne1 has got ne motors from around 20cc-40cc plz email me and tell me a price.

-- steve (, September 29, 2003.

if any1 is after a honda cub 90 (100% cmplete, has't been started for about 2 months) i would trade for 2 small garden engines. email me if your interested

-- Danny Stubbs (, October 01, 2003.

Hi everyone, i am working on putting a small edger motor on a scooter with 12inch wheels, direct drive. I really have no clue on how i can mount the motor. It is confussing me. Any help would be greatly aprecciated.

-- Matt (, October 06, 2003.

I am putting a small 3 hp weed eater motor on a scooter. I have got the motor together and am wondering if friction drive is the way to go. If not what do i do? I am completely lost. I need help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Any one have any plans? If so e-mail them to me at I need help mounting the motor too!

-- Taylor (, October 07, 2003.

The cable on the weedeater is flexible. I tried putting a skateboard wheel on it but the cable turns while the wheel stands still. How do i attach a gear to the motor since their isn't a shaft just a bending cable. The turning part is in a sleeve and i don't know what to do. HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!

-- Taylor (, October 09, 2003.

lawnmower engines are the way to go because of their power and they are a lot more reliable. The only problemo is u cant turn em on their side or all of the oil will drain out of the pistons etc. For this reason i reckomend bolting on a two stroke lawn mower engine instead to eliminate this problem. These are great they have heaps of power and if u set it up properly u will get a nice power band as well. GOOD LUCK and HAVE FUN

-- Troy reid (, October 11, 2003.

wheel diam (m) wheel circ (m) final speed(kph) final speed(mpm) wheel rpm engine rpm ratio 00:1 circ of roller (m) circ of roller (cm) diam of roller (cm) 0.25 0.7854 35 583.33 742.72 12000 16.16 0.0486 4.8611 1.5473 0.25 0.7854 30 500.00 636.62 12000 18.85 0.0417 4.1667 1.3263 0.25 0.7854 25 416.67 530.52 12000 22.62 0.0347 3.4722 1.1052 0.25 0.7854 35 583.33 742.72 11000 14.81 0.0530 5.3030 1.6880 0.25 0.7854 30 500.00 636.62 11000 17.28 0.0455 4.5455 1.4469 0.25 0.7854 25 416.67 530.52 11000 20.73 0.0379 3.7879 1.2057 0.25 0.7854 35 583.33 742.72 10000 13.46 0.0583 5.8333 1.8568 0.25 0.7854 30 500.00 636.62 10000 15.71 0.0500 5.0000 1.5915 0.25 0.7854 25 416.67 530.52 10000 18.85 0.0417 4.1667 1.3263 0.25 0.7854 35 583.33 742.72 9000 12.12 0.0648 6.4815 2.0631 0.25 0.7854 30 500.00 636.62 9000 14.14 0.0556 5.5556 1.7684 0.25 0.7854 25 416.67 530.52 9000 16.96 0.0463 4.6296 1.4737 0.25 0.7854 35 583.33 742.72 8000 10.77 0.0729 7.2917 2.3210 0.25 0.7854 30 500.00 636.62 8000 12.57 0.0625 6.2500 1.9894 0.25 0.7854 25 416.67 530.52 8000 15.08 0.0521 5.2083 1.6579 0.25 0.7854 35 583.33 742.72 7000 9.42 0.0833 8.3333 2.6526 0.25 0.7854 30 500.00 636.62 7000 11.00 0.0714 7.1429 2.2736 0.25 0.7854 25 416.67 530.52 7000 13.19 0.0595 5.9524 1.8947 0.25 0.7854 35 583.33 742.72 6000 8.08 0.0972 9.7222 3.0947 0.25 0.7854 30 500.00 636.62 6000 9.42 0.0833 8.3333 2.6526 0.25 0.7854 25 416.67 530.52 6000 11.31 0.0694 6.9444 2.2105 i made this up on MS excel for my own project

-- Sam Flannery (, October 11, 2003.

sorry about that. email me if you want the table of ratios etc

-- Sam Flannery (, October 11, 2003.

Hi all hi im an australian so some of the measurments/ weights i couldnt convert so bear with me. I own a fairly old mountain and a fairly old lawn mower and after reading the whole thread (took me friggen ages) i dont whether to use a lawn mower engine or a chainsaw engine, im guessing the lawn mower engine deveolps more power but im not sure. Using the more powerfuller of the two do you reckon i could power a mounatin bike , with me on it total weight of 60 kgs (dont know in pounds :( ) and still travel on my 24" wheels. i dont need help with the technical side of things, just want to know if therre be enough horses for me to move..... and i read the web page Bue flame and almost pissed myself luaghing after hearing the story of the guy being scared to jump of lol then i saw the pictures and luaghed even harder (big fall :P ) but it taught me alot, im almost 6 foot and i cant see myself riding something that small, so i could only manage a mountain bike (and i dont like the idea of putting it on a scooter), so yea, is it possible for me to get moved? ( i think total weight would be somewhere in the 140-150 pound region, on 24 inch diameter wheels)

Thanks heaps, for any help

PS anymore "How To Build" URL's would be greatly appreaciated

Cheers Miles M.

-- Miles M. (, October 12, 2003.

I have a question. I have a 33cc chainsaw and an old mountain bike. what i was thinking, was that i could mount a bike sprocket to the outside of the clutch on the saw, and have a chain run to the left pedal shaft on the bike. That way, i would still be able to use the gears. someone tell me what they think

-- David (webly@HOTMAIL.COM), October 15, 2003.

to the kid that took off the muffler dont do it for to long the engine needs the compression from the exhaust. if it dont have it your engne will not run ever again.

-- Mike ----- (, October 15, 2003.

Hey, im putting a old chainsaw motor on my mountain bike. I had 3 mounting points, i drilled 2 holes through the bike frame and used machine bolts through them into existing holes in the chainsaw. The other place i used a 200 lb. limit plastic tie. Im replacing the centrifugal clutch with another centrifugal clutch that a bike chain fits on. Im not sure if it will be enough power but if not oll just get another rear sprocket for the rear wheel. Im using my brake lever for a throttle. Email me an tell me what u think or give suggestions thanx.

-- Jack T Larkins (, October 16, 2003.

I also am trying to connect a chainsaw engine to a bike(that has no gears) Would it be simple enough to take off the old chain of the bike and put on the chainsaws and put a brake clutch on the power button so when I want to go I squeeze the brake? Would that work easy enough or do I have to take off the old pedels and stuff?

-- Matthew (, October 27, 2003.

yeh shit dam fuck cunt poo weaner slut

-- frenchy pebble (, November 06, 2003.



hello ive just built a petrol motorized kids bike.I used a lawmower engine with a horizontal shaft bolted a spindle to the end.Then i mounted a door hing to the bracket mounted that to the frame and had a cable from the engine to a brake lever off of a normal push bike.Then u pull the lever wich pulls the engine down wich hits the wheel and then bumps to start it roughly goes 10-15mph.Its grate fun going up and down the road

-- scott (, November 12, 2003.

i need ur help guys. i have a 2hp weed eater and first i dont know how to take it apart properly. second i want a friction dirve. and thrid i need help in mounting the engine without any welding. finally if possible do u guys have any idea on a throttle. any help,plans etc would be great and pleas post it up on the site. i am very greatful for you guys thanks again

-- kurt nazry (, November 17, 2003.

yes a 2h weed eater motor will be fine,to take the engine apart u will need to undo the head bolts pull the head off. And then watch it because when u put them bck on youv'e squash the rings together im only 14 years old and i have taken my engine apart and rebuilt them. Next the throttle just connct it to a brake lever off a push bike.And finally mount the engine make a bracket out of still plate or alliminium cut out to shape and bolt it together. Ihave made a push bike with an enine on and it goes alright.

-- scott (, November 18, 2003.

sorry 2hp

-- scott (, November 18, 2003.

hey if anyone has a small drive sprocket (5-20 teeth) with a 1/2" bore please let me know a price. thx, steve

-- steve (, November 19, 2003.

well i have taken the weed eater apart and im lost. ive taken the metal pipe out and i have just the engine and the spindle head. i dont know how to attacth them to each other and more importantly i dont know how to use it. i want a friction drive without any welding and i simply cannot think of anyways of mounting the engine to the bike. any help would be great guys and thanks again

-- kurt nazry (, November 22, 2003.

hey, thanks for all ideas, but does anyone have any websites that have drawnout plans, preferrably Autodesk Autocad .dwg or Autodesk Inventor .ipt or .iam with dimensions. If so, please post the URLs or email the URL to my email.

-- (, November 26, 2003.

the optimum engine would be a STIHL 4-MIX ENGINE. It is a four- stroke engine that runs on a gas/oil mixture. It has valves like a four stroke, put part of the gas/oil mixture is diverted to pass through the crankcase, so there is no need for an oil reservoir. The end result is a four-stroke engine that can be turned on its sides without destroying it. An article on it was in the last issue of Popular science and more information can be obtained at

-- (, November 26, 2003.

correction, thats

-- (, November 26, 2003.

I had the Idea of using a skateboard or other type of vehicle on the sand by putting treads on the back, and wheels or a ski in the front for steering, so that I could manuver in the sand. I was wondering how a chainsaw engine would do, because the chainsaw engine is already made to turn the chain or blade of the chain saw, so wouldn't treads work kinda the same way. Also I was wondering about stopping and slowing the board down. If any one can offer some helpful tips of things to be weary of let me know, thx.

-- Ben Felts (benfelts70@hotmaIL.COM), November 28, 2003.

hey does anyone have any ideas on what size sprokets to use on a 26cc weedeater engine on a scooter. thanks

-- tommy (, December 17, 2003.

OK, i know that this is a andom thing that im gonna ask but do any of your guys know how to get rid of the ice that forms in windscreens of cars?.. i know that you can use a scraper, but i want an easier way.. ive heard of a way that stops the ice from forming in the first place.. but a cannot remember what it was.. anybody got ideas about how to get rid of the cie that forms on windscreens????

-- billy harris (, December 17, 2003.

hey, couldn't you take a 3 or 4 horse briggs and stratton vertical crankshaft engine, and attach a roller to the crankshaft with rubbery material on the outside, so you could put the engine above the rear tire ands have the roller turn the wheel by the brake area.

-- george (, December 19, 2003.

it might look something like this

_____ / \ -- -- 1 1 vertical crankshaft 1 1 <-engine ------------ ! !<-crankshaft ! ! __ ! !! ! -----! ! ^ ! ! rubber ! ! <-tire outside ! ! ! ! ! ! ! ! ! ! ! ! !__!

-- george (, December 19, 2003.

uh oh, i guess it didnt turn out like i wants, someone should make it so u can put picturees in

-- george (, December 19, 2003.

My son and I are building a what is called a mini moto or pocket bike only this is a custom. Using a 52cc or larger chain saw engine, we are incorporating the vast supply of parts for these type "motorcycles" and they aren't too expensive. Some web sites to visit are and These sites might help you out and seeing the parts available might make you go back to the drawing board and really get crazy...

-- Lee Kendrick (, December 27, 2003.

Hi all, Have a good christmas?

Does anyone know the horse power that a Ryobi 31cc Two stoke engine gives out? What gear ratio should I use if I used it to power a small scooter? Whould it move an adult? I would be greatful if someone can help me please!

Thanks Ian

-- Ian D (, December 27, 2003.

a wicked site for homemade scooter plans in detail and pictures is

-- James (, December 28, 2003.

Hey everyone. If you are having problems with your scooter gear ratio there is a simple solution. Go to yahoo at type in tzi scooter world. It will say tzis scooter world has moved. Click it and follow the links and on that website there is a gear ratio calculator. Also you can view alot of homemade scooters and some movies of a kid riding his. If you have any questions email me at

-- Tommy (, January 13, 2004.

my name is nathan and i make motorised bicycles any questions ring 0415989690

-- Nathan (, January 19, 2004.

hey, i am tryin to build a motorized push scooter with a wipper- snipper engine but i can't figure out how to mount the motor onto the scooter and drive the bak wheel? and for the chain saw idea i would go for the bike parts.


-- sam (, January 19, 2004.

If I take a weedeater enginge and attach it to the back wheel of a scooter by using a chain and two sprockets, how do I keep the scooter from moving when I first turn it on? Do I need some sort of clutch or should it be fine the way it is? I would appreciate some help.

-- Christopher Finley (, January 19, 2004.

If you weld on the sprocket it will mess up the clutch.

-- Billy (, January 23, 2004.

HOW ABOUT 160cc. I have been riding my Victa 160cc 2-stroke pushbike (BMX) for months now, no problems. top speed of about 70km/h, friction drive machined out of alloy wheel.heaps of torque!!!! Next project is to mount a 160cc to my 18speed mountain bike. what I'm asking is I'd like to some photo's on the web, how can i do this, ie http address.Ps why bother with chainsaw or wiper sniper motors?????

-- Pat Dacron (, January 25, 2004.

im thinking about putting a 21cc mucculloch strimmer engine on a scooter what would be the best drive to get more power

-- (, February 02, 2004.

just use a 10teeth sprocket at the front and use a 60-70teeth sprocket on the bck this will go about 40mph+

-- bler (, February 06, 2004.

can anyone help me with info on a gearbox or so calld reduction box for a small 30 to 40 cc honda motor in america sells them is there a place in Brisbane or aus who do ???

i want to mount a small engine to my Brick Buggy it will carry weight of 275 kilograms so i need a reduction box so i dont snap cranks 18.75 to 1 is what want to sell me thanks

-- Harry Moman (, February 12, 2004.

i have a 16 inch bike and want to put a wipper snipper motor on the back wheel i want it chain driven so its gunna need a clutch but i was wondering what would be better a chain saw motor or a whipper snipper motor and what are the clutches like in the two of them

-- towl bred (, March 02, 2004.

i was wonderin how to hook up a wipper snipper motor to my 20inch bmx bike. it would b sweet if anyone gave me an answer. thanx

-- matt swindle (, March 09, 2004.

Check out this website for pictures of a motor driven BMX...Hope it helps someone...bad email address

-- Phill (1@2.3), March 19, 2004.

i have a old blue homelite chainsaw and i can't get it going. the only way i got it to run so far is pour a little bit of gas doing the sparkplug hole, but it only runs for but 5secs or so, anybody got any ideas on how to fix it?

-- Wayne Macmillan (, March 20, 2004.

I have a billy cart and I want to put a whipper snipper or chainsaw motor on it. has anybody done this before if they hane can you tell me how

-- mitchellpoint (, March 22, 2004.

why dont you get a kids scooter and attach a 52 tooth kog to the back wheel and then attach the engine and throllete to the top and attach a petrol tank

-- matthew (, April 08, 2004.

i want to make a petrol scooter does any one have any ideas if you do please e-mail me

-- matthew (, April 08, 2004.

Hi... im trying to use a old razor scooter and i also have a gas powered weed eater motor...I REALLY NEED SOME HELP .. im not sure on how i should attach the motor to the wheel

n e help???

-- Michael S (, April 11, 2004.

Its simple to make a motor bike. I have a Craftsman 25cc weed eater engine im going to use. You can go to a metal shop or order online a piece of iron or steel or aluminum. Im going to get iron because its cheap. It should be about 1 inch wide and 2 or 3 inches long. Drill a hole in the center the same size as the rod coming off the flywheel, then you will have to pull out a saw and make notches running down the outside of the spindle so it will grip to the tire, its going to be a friction drive (the spindle rides on the tire). You will have to weld the the spindle to the rod on the flywheel. Then you just have to mount the engine to the bike and put springs on it to keep tention on the engine to tire. When you go a few mph the engine will kick on and when you stop it stalls. Thats how a lot of gopeds work. Then if you want you can fix up the engine by getting a walbro Wt-334 carb, lightening the flywheel, lot of stuff. Hope this helps.

-- Brandon Heltzel (, April 22, 2004.

I ran into this web site by accident and I have just one thing to say. If you can not figure out how to build a simple motorized scooter by yourself, then how on earth do you think any of you are going to be able to take other peoples ideas and do it? It is cake, you just make it work, use what you can, its like easier than than writing your name! Oh by the way Keyboard 100, you have spent way too long figuring this out, if you are not smart enough to put it together in a few hours, move on to something a little easier like legos. Bye all, dont strain your little minds to much, and remember, if you get too confused by any of it, stop, and make sure you did not go stupid by saying the abc's to yourself queitly!

-- pro karter 21 (, April 26, 2004.

A great site for homemade motor scooters.

-- Brandon Heltzel (, April 29, 2004.

i was wondering if someone could send me plans on how to build a motorized scooter with a chainsaw engine. I want the scooter to be a chain drive.

-- Trent Mulcrone (, May 04, 2004.

Want yall just by scooter or pocket bike or whatever PEP Boys auto store sells Chopers to mopeds now take apart and let yourminds goto to it. price ranges$199-999. Cause time you get all this figured out you wasting more money .Just go buy one then take parts and mod them to your design. Plus most engines on them are all ready High Pro.

-- todd (, May 06, 2004.

Heya all dose any one here got a good cheap easy to build plan of puting a ryobi 31cc whipper snipper on a push bike ?! (just send ada plans ASP (goter be cheap to make an fast !!! + releierbul

i had a ryobi on push bike it got about 40 -50 KMPH but it was freiction drive so it dittnt last

-- matt (, May 07, 2004.

You need to get EV PARTS catalog. It's Electric vehicle parts. A company specializing in electric conversions of automobiles, trucks, motorcycles, and... scooters. They may have some leads (no pun intended) on drive train parts.


-- BV (, May 07, 2004.

Now, to express my opinion about "What would be the easiest most reliable power delivery method to the drive wheel?"

Bevel gears.

-- BV (, May 07, 2004.

I've got a 36cc saw engine mounted to the front forks of a Mountain bike, it's chain driven, these projects take a lot of work... and re work,

-- Dwayne (, May 09, 2004.

I got a mail from one "a a ", I do have some troubleshooting knowledge for you, I failed to get your mail address. I will say this thou, my bike is all about fun, its not reliable......., I usually break it every 3 to 4 rides. I've thrown my chain twice, I am also still trying new cogs/toothed spockets all the time, I figure the bike goes about 30 to 35 mph, fun stuff out on the trils, i'm sure the rough terrain has a lot to do with the chain problem. Good luck to all with your projects..........

-- Dwayne (, May 18, 2004.

hey i have a push scooter with sixten insh wheels and a 35cc kawasaki brushcutter engine and i am making a scooter. i was wondering if you could give me some tips on what gear ratio i should use and how much the sprockets are. peice out.

-- william wall (, May 19, 2004.

hey all you people i think motorised scooters suck. why dont if you want one just buy one why ake your own. why dont you start playing footy or something.

-- not telling (, May 19, 2004.

guck off

-- Mugu Ghana (mugu@magas.mag), May 26, 2004.

So, I'm in the process of designing a second mountain bike this time i'm going to mount the engine over the rear wheel. I'm going to use an older model Stihl 460 saw, i've got a predicament thou, I'd perfer to leave the casing intact so I figure a bracket system, any ideas?, they would be appreciated, thanks..

-- Dwayne (, May 31, 2004.

I made a "weed-eater" bike way back in 1999 before this thread started and it was fun to read how many people have solved this their own way. I think the "best" is whatever you have time and resources to complete. I wish that I had more time to get my bike modded even more. I'm in the process of adding a rear disc brake and longer rear triangle to eliminate the wheelie factor. (the seat on 18" seat post is right over the rear wheel)

My bike has 3 speeds with gripshift shifters, 23 or 27cc weed eater modded, clutch, and 12" wheels. It's capable of 20 mph on the flat and can climb modest hills slowly in first gear. It's not a real powerhorse, but 20 mph on a 2'-2.5' wheel base feels like your rippin'!

I first started with a direct drive system from a 9 tooth sprocket that was machined narrower to fit standard bicycle chain through a clutch to a rear sprocket almost as large as the rim (tire taller). This proved to not work with the clutch slipping all the time and no real RPM's allowable. After doing some math, I figured out that the bike had to go 50 mph for any decent RPM with the gear ratios I had. Not gonna happen with only 23 cc's driving it. I solved the problem by adding a jack shaft where the bottom bracket mounts (no more pedals) through industrial sealed ball bearings. I simply added extender pegs to the front tire and comfortably rest my feet there. I think I used two of those machined nine tooth sprockets, one on the motor (clutch)that went to some 30-something toothed sprocket, and one on the second chain that drove the big sprocket on the rear wheel. I installed the rear sprocket to a 3 speed internal shifting hub with grip shift on handlebar to control the gear. I added a $5 twist grip throttle.

Here's the best part.... motor-free, bike $5, levers, $5, sprocket parts $5 or so, plus lots of old junk laying around, tires and tubes $25. Time----don't ask it was months before this thing hit the road.

Thanks for keeping this sight going for over 3 years, keep the rubber side down and be safe, I once lunched myself over the bars when my cable actuated rear wheel pedal type brake in the front wheel locked up at 15 mph. Don't use rear pedal brakes in the front wheel, bad idea. I now have some cheap caliper brake that does the job okay, but I'd like to add the disc my friend gave me to the rear wheel.

-- Randy Gregory (, June 01, 2004.

I am making a motor bike now. I have about a 25cc or 30cc engine that I just took off and put a rotary carb, ported the intake and exhaust out a little and other stuff. I'll tell you guys how its coming along soon.

-- Brandon Heltzel (, June 06, 2004.

I am making a motor bike now. I have about a 25cc or 30cc engine and I took off the stock carb I just took off and put a rotary carb, ported the intake and exhaust out a little and other stuff. I'll tell you guys how its coming along soon.

-- Brandon Heltzel (, June 06, 2004.

Dang, sorry about the double post.

-- Brandon Heltzel (, June 06, 2004.

Ooh! Ooh! I know this one! Pick me! If you don't mind using a push scooter with larger wheels (12"), it's a piece of cake: Use a 12" rear bicycle wheel with a cog on it, replace the chain saw's cutting chain with a standard bicycle chain and add a throttle cable up to the handlebars. (Bolt the chainsaw, minus the cutting bar, to the rear of the scoot's footboard.) And don't forget to CHECK THE BRAKES! Ya-Hooooooooo!


-- ass man (, June 11, 2004.

hi i am a fourteen yaer old kid who builds things in my free time (duh) I am currently working on how to put a chainsaw engine on a bicycle and have a good idea... i made calculations about the gear ratio and engine power needed to get the proper aceleration and top speed on a 26 speed mountain bike here are some figures: with a mcculoch 2.0 C.I. chainsaw engine (wich has a clutch that can be modified to take a bicycle chain) and a wheel diameter of 26" the bike weighs about 40 pounds plus me a 105 pound rider and a gear ratio of about 26:1 an engine max RPM of about 13800 @about 2 HP a total efficiency of about 80% taking into account bearing drag tire friction and chain friction and even some wind friction and a top speed of about 40 MPH you can accelerate at a speed of roughly 12.5 meters per second^2. i hope this helps. :)

-- Gollum (, June 17, 2004.


the Acceleration rate is roughly the same as that of a minivan with a v-6 Engine, if you take the muffler off a chainsaw engine it decreases back pressure and will actually improve the performance greatly because of how a 2-stroke engine works it'll probably add about 1/4 HP extra and it'll probably increase RPM i'll try it and tell you how it goes.

-- Gollum (, June 17, 2004.


-- JONESY (, June 19, 2004.

I was wondering how to make a weedeater powered bike or moped weedeater bike . If any one knows how to connect the weedeater some how to the rear sprocket of a 18 speed mountain bike. please tell me how or email me plans or how to's. Also how to mount the engine on the bicycle. Will be nice to know. THANKS

-- Brandon A. (, June 21, 2004.

you can't use a weedeater the clutch isn't strong enough you'll burn it up in a few minutes if you get it to work at all. what you need is at least a 36 cc chainsaw without the bar or cutting chain you need to weld a sprocket onto the clutch bell and connect that to a jack shaft with a sprocket that is about 15" in diameter and connect that to the rear wheel sprocket via bicycle chain chain and the deraileure needs to be rotated around so you can shift gears you'll also need to add a cable and a thumb-throttle to the the engine and bike chainsaw clutches are much stronger than weedeater clutches. to mount it on the bike you need some piping a hammer some bolts a hack saw a drill and enginuity. hope this helps.

-- Gollum (, June 21, 2004.


-- azza (, June 25, 2004.

Well take it apart and look at it. They dont sell any sprockets to turn a chainsaw into a motorbike. If your gona make one your going to have to see how things work and try building it yourself. I would just take the bellhousing off the clutch and chop the sprocket off for the chainsaw chain and weld a sprocket that will fit a bike chain of something.

-- Brandon Heltzel (, June 27, 2004.

i am looking to make a gas powered scooter out of a weed wacker with a 23 cc engine. If anyone has any ideas i would appriciate it

-- Peter Hatsow (, July 06, 2004.

i am looking to put an engine on my mountain bike does anyone have some plans and what i need to buy to put it together

-- brandon vescio (, July 08, 2004.

what does friction powered mean i think is when u atatch a wheel to a motor spindle and make that wheel lean onto the main scooter wheel or bike wheel plz answer this question as i am currently making a whipper snipper powered scooter because me (14) and my freind kahlil (14) put a weedeater wpr snpr motor onto a normal steet scooter (friction powered) and we were beating cars on a 50 km(speed limit) road so it was going like 55 to 70 km. man it was the best fun ever and it was so funny seeing this little scooter going that fast lol

-- jamie whalley (, August 11, 2004.

information in how to put a pipe into a 36cc Gas Scooter and where in the motor would i put it at

-- Leonel Frias (, August 14, 2004.

ok ok ok i am gonna let you all in on a few points... my dad is an engineer, he has all the best methods for this kind of stuff and this kind of stuff is what i do!

1. first of all, DONT THINK OF FRICTION DRIVE!!! no ppl really it sux beyond the reaches of the land suck! you lose power and no one wannt to do that!

2. if your using a petrol motor generally the best gearing (to preserve engine life) is about 1-5 (for thats example 10 teeth on the drive sprocket on the motor and 50 teeth on the sprocket on the wheel). To make a fast scooter with average take off use about the gearing 1-5 but if wheel size allows i personally use about 1-7, 1-8, 1-10 even (this ensure very fast take off but slow top speed). Idealy you want some where in between... that takes some trial and error)

3. use chain or belt drive cant stress that enough i prefer chain drive coz there is nothing worse than a snapped belt!

4. i use a calculation to determine about how fast the scooter is gonna go before i build it and see whether its worthi my time, needs different parts or what ever (i am australian and all my measurments are metric in millimeters (mm))

to perform the calculation you must know the following... -speed of motor (revs) i belive a standard brush cutter does about 8000 revs -teeth on the drive sproket -teeth on the wheel sprocket -diameter of the wheel in mm

all you do is type into a regular calculater as follows

(engines revs)x(teeth on drive sprocket)/(teeth on wheel sprocket) x (wheel diameter in mm)/1000x60/1000= speed in km/h

i understand metric probably doesnt help much but surly u can convert these mesurements!

also that calculation doesnt give the speed you would have with a load (such as your self) so you would go slightly slower than your answer depending on your weight plus the scooters weight.


6. motors generally work best if positioned above the wheel

7. mountain bikes suck with brush cutter and chain saw motors, their wheel are way to big and the little motors have trouble hauling them along!

8. make sure the wheel sprocket is slightly shorter diameter than the of the wheel

any way thats my rant and informative turn,

happy scooterin!

-- Beaux (, October 05, 2004.

i am going to make a motorized skateboard with a 21cc weedeater motor

-- asdr (, October 05, 2004.

Hey Guys I'm an Aussie aswell and really interested in taking a weed eater engine and fixing it to a scooter. couple of things - What kind of scoter to use (or how to make my own) - any sketches of engine mounting would be good and how to max out the power with the 2 stoke I've got

hope someone can help!

-- Tim Jensen (, October 15, 2004.

Yeah and another thing or mabey two things

is it worth making the scooter with a 18cc engine and where can i get pics from to help me get started

hope one of all you smart people can help me out!

Remember pics pics pics PLEEEEEEEEEEEEEEAS

-- Tim Jensen (, October 15, 2004.

sorry tim no pics, but a fact is its not really worth puttin an 18cc motor on anything but the weed eater or pathetic chain saw it was when it was new, the point is they suck, something worth while has to be about 25cc+ or its not worth the time or effort to make it work.

also a 22cc skateboard would be an interesting example of suck. i spose u could keep the orignial wheels if u put a hinge and a plate on the rear kick of the skate board attached to the motor with a small push bike wheel on the motor but i wouldnt bother... it would be to damn hard to start the thing because you would have to turn the weight of the wheel when pull starting it and that would destroy the zip start function, wrecking your engine (unless u want to replace or substitute it ;)) the only way to do it that way would be to have a clutch system but i dont know a weed eater or a chainsaw that has a clutch that could take that kind of punshment

-- Beaux (, October 16, 2004.

can somebody less sceptical please answer my questions

-- tim (, October 17, 2004.

Hey sorry dude, dont listen to my brother, thanx for the advice I'll get a bigger engine. 18cc just lying around the house still apreciate any pics and stuff!

-- Tim Jensen (, October 18, 2004.

my dad recently bought me a 33cc ryobi weed hornet whippa snippa engine to put on a dirt scooter it will be hard to mount it but my dad hs an idea (itll take to long to explain.any way when we bought the engine it had a minor fuel leak the pull cord was also very hard to pull we took the mot a part and found that there was melted plastic in the centrifugal clutch and the the shaft had palsic on it we filed the plastic off and this weekend we are going to mount to a scooter with achain drive. but will the clutch handle this much pressure?

-- jamie whalley (, October 20, 2004.

Hey all, im a 16 year old aussie and have been very interested in making petrol scooters for about 4 years now. I have already built 3 of them, they all worked great but my personal favorit was my last. SO LISTEN UP THIS IS A GREAT TIP THAT NO ONE HAS POSTED YET! as weed wackers have a very weak clutch u cannot run a sprocket straight on to them or the sideways pressure will ruin ur cluch within a few hours. So i came up with the idea of usin a simple, GRINDER HEAD! all you do is detach the grinder head from the grinder and you can run you flywheel directly towards your wheel thus no pressure on the clutch! my cluch has been used foe a year or so now and is still in AS NEW CONDITION! the grinder head also is geared down so you dnt have to worry about putting a huge back sprocket on and a really small front one on! Anyone who wants a rough drawn up diagram of what im talking about just email me and ill send you one!


-- Mark Groten (, November 02, 2004.

Mant great custom made gas/eletric scooter and what not. Also, brand name scooter and help for your engine needs. Come join! referrerid=92

-- X (, November 07, 2004.

Dear Respectful,

I am a young man of 20 years old , my name PETER MANE,While my sister name is REBECCA MANE we are childrens of late Dr and Mrs.COKER MANE From france-ville Northern GABON, one time political Director of GABON PETROL who died on board meeting with the International Oil Gulf Representatives, in September 11th 2001 at the World Trade Center in New York City USA.Sorry I do not know whom you are, but I feel strong to write you concering my present predicament at stake now. I was an under- graduate student of 2rd year, studying Chemical Engineering At Omah Bongo University in Libreville the South-Eastern Gabon, before the date of the urgly incident occurred last three years.

Presently we are in Abidjan Cote d' Ivoire,where I am looking or seeking for someone who will assist me in transfering the sum of money my father left in a suspended account of a Bank here in Abidjan. The amount is Eleven Million US Dollars ($ 11, 000.000.00). However since, hence he made the deopsit in favour of busines partner , I have contacted you to stand as my Late father's foreign parter to receive this money into your account after which I will join you there. l are willing to offer you 10% percent of the total sum of amount, to you for assistancing me and you will handle the investment until l finished up my education,and any expences you made in this transaction must be minus including your perscentage before investing the money.

In addition I humbly solicit for you kindly assistance to help me in investing this money into a good and profitable business, really my intenssion for contacting you is not only to help me in tansfering this fund out of this country but also to help me to invest the the money into a business that give at profit and nice school where we will finish up our education. I am assuring you that this transaction is hatch free from all indication, because all the document that was issued to my father at the day he lodged the money are with me and the are avilable to you on your request.

Please understand our condition and get to me as soon as possible and please I urge you to keep this transaction confidential for my secuirty and the security of the money.

I will be waiting to hearing from you soonest.

May God bless you.

Yours Sincerely


REBECCA MANE( my sister)

-- PETER MANE (, November 25, 2004.

Hey! can any1 help me.... im trying to build a go-cart like car and wanted to know if i put dual 5 hp engines on it if it would work if a 90 lb kid tryed to use it... any awnsers would be me them or put them on the site... if u email me put subject as "site"

-- Wade Hunt (, December 07, 2004.

Wade.....If you mount two 5hp motors on a cart you could pull a car with that? Easy big boy! I build motor driven scooters myself. I have a direct drive 50?cc husqvarna chainsaw engine scoot I just finished building. This is my third custom build among many that I have purchased. the new runs at the appx. speed of 45mph. not to mention it carries my 250+ weight! I've been doing this for about two years and never see any custom scoots. I happen to be web watch'in when I came across this site. Good seeing some innovative alike minds out there. I addition I found a site that may help many of you out there.Cause the same question keeps coming up "how/where do I start?" "can I get some plans to start?" well GO TO . I know that this may be one of you guys that own this web site? but I'm not stealing it just referring it to the ones interested!! plus there is no name to it that I noticed. you can ask for pics and I can respond

-- matt brown (, December 09, 2004.

thx alot.... i didnt know how much power it would need.... can u send me some pics?it would be really appreciated

-- Wade Hunt (, December 10, 2004.

hey, im looking to make a gas powered scooter. my car gets terrible gas milage and i just want something that can get me the 15 blocks to school. I have thought of using a razor scooter and either a weed eater motor or a chain saw. I have leaned towards the chainsaw because it has a clutch. I weigh about 150 and i know how to calculate the gear ratios needed but i was just wondering how to get the power from the chain to the wheel seeing how it is just a little ruber wheel with no axel. thanks guys, and if you have any pics or plans it would be awsome if you could send them to me.

-- artimus (, December 28, 2004.


scooter wheels do have axles... just that they arnt long enough to mount anything onto the clearance between the wheel and framework is much to small to fit any type of sprocket worth your time...

get over it and 1. buy a scooter or 2. build 1, dont turn a razor into 1, they are aluminium and are bastards to weld and such unless u have an aluminium welder... or 3.Ditch ya crud box car and walk... its not that far...

have fun

-- Beaux (, December 30, 2004.

Hi...can anyone tell me how fast a two stroke blower/chain saw motor spins? For gear ratio purposes.


-- Dennis Oates (, January 19, 2005.

Hi there i have a ryobe lawnhornet , every1 tells me its a popular motor, i got the motor i got the bike to put it on,How do i mount it over the back wheel?Someone suggested that i put a packrack over the back wheel, but i dunno.Im direct driving it with a stunt peg rubbing on the back wheel.Even though motorized bikes are illegal, im hoping to ride this to school one day.Any emails appreciated.Thanks

This site rocks :D

-- Matthew w (, February 11, 2005.

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