Re: Would you like to help a bunch of teenagers go fast?
Seems like you might have a hard time transferring the power from the bottom shaft over the right angle to drive a sprocket.
If your not set on that motor you might be better off looking for a motor that has a side shaft drive, much easier to translate to drive a bike tire. I was looking at my old Toro S-200 snowblower the other day and noted how the small 2-stroke motor is about the right size and has a side shaft that should be easily adaptable to a drive sprocket. So a small two stroke snow blower motor would be something I would look at... that is if you dont want to build something from a kit like is available from the sponsors here....