re: Motorized Bicycle Take a Tip...Leave a Tip
number one: pedal.
two: I usually find them attached to bicycle wheels. (sorry. google it. there's a bunch of different manufacturers.)
three: after reading this sentence, look to your left and to your right. click some of those links. (i was gonna say, "mounted in a bicycle frame," but i let you slide on that one.) or check ebay. they're everywhere.
4. if you want NOS, go to a dentist. if you insist on putting it on your bike, then you should try to find a few more engines for under 150 bucks. you're gonna need them.