Instructables

How to power your bike with a whippersnipper motor

Contest Winner

Step 6: Riding

This is the fun bit. If u used an old motor like mine that is very unreliable and crappy, it would be best to carry out some maintenance on your engine. Also unlike me it would be wise to put brakes on your bike!!! I got quite a scare going into a busy intersection with thongs (flip flops, sandals) as my only brake.

Also check the legality of these kinds of mods, in NSW, Aust, to be legal it must be under 800watts of power and under 25cc or something. I’m sure cops would love to book someone causing trouble on a motorised pushbike.

My bike when the engine was running nice did 40kmh easy on flat. I put nitro fuel (15% nitro methane, the stuff used for R/C cars) in it one day and it went ballistic, it scared me.

The clutch on mine wore out pretty quickly coz its old n I’m heavy n didn’t want to pedal at all. But if your light or have a more powerful motor u don’t have to pedal ne time except for start off and really steep hills.

Thanks for reading my instructable and please vote for it in the Park Tool Bike contest!
 
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mista.v3 years ago
What about a killswitch or some kind of clutch to disengage?
b-train (author)  mista.v3 years ago
Theres an ignition killswitch on the front of the engine near the pull start, and it has a centrifugal clutch built in.
KiW3 years ago
WOW, thats just cool, I wanna have it too, but then you got the problem... cops... law... here in holland they dont allow your to drive on cool stuf only borring things are allowed here... damn still gonna do it with a cycle I have left some hwere in the middle of no where. thanks dude looks cool!
In fact that is a great performance. keep it up. but please could you explain to me the mechanism involved . how the motor is able to power the bicycle wise_coleman@yahoo.com
tsulvin4 years ago
that's tight
1Scray4 years ago
Do you have any action photos.....with you flashing a nice British smile!!!!
hi i am doing the same exact thing you did in this instructable. although im using a motor scooter engine. i need help with mounting. email me at (risewiththefallen15@gmail.com) or (dlesterjr1@yahoo,com)
lilrou155 years ago
AWSOME
chinnerz5 years ago
you wouldn't happen to know what is legal in the ACT would ya? or at least where i could find out? i rate this 5 outa 5
b-train (author)  chinnerz5 years ago
http://www.zbox.com.au/legal.htm

down the bottom is act, its basically the same as everywhere else, under 200w is ok over 200 u have to treat is as a motorbike or moped
hahah, sweet. so making one which is 199w thx iou
dilg6 years ago
Great job! Voting on this project because I made a similiar bike when I was a kid. It was a clutchless weed trimmer engine mounted to a Haro freestyle bike. We were limited to a few hand tools so the design wasn't nearly as neat as yours. I used a scrap of 4 inch square fence tube for the bracket. It was maybe 8in long and we cut off two sides with a hacksaw so that it formed a huge L-bracket. We drilled holes in the bracket to match the pre-drilled brake mounts on the back of the frame under the seat. Holes were also drilled in the vertical part of the bracket to match a few threaded holes on the face of the engine mount near the shaft. The shaft was only 1/2in diameter, so we centered a segment of 1in copper plumbing pipe over the shaft and filled up the void with plaster of paris :-) To add friction to the shaft we slathered it in two-part epoxy. As with your project we ran the original rear brake cable to the throttle lever on the engine. We clocked the top speed right at 35mph. My friend would ride downtown and back on a tank of gas!
atnekn6 years ago
Is there enough pressure from the top to rotate the wheel? Does it not slip or something? I have a chain driven motor bicycle and Im having some problems mounting the engine after the bolt vibrated out and Ive drilled into the casting and I messed it up a little. Suggestions on how to attach a motor to the frame?