I got a totaled scooter free and put the engine on the back of my mountain bike with a small aluminum frame that i built with only a hack saw and a hand drill in my living room. There was no welding or anything, everything is drilled and bolted. It can do 50mph on flat ground but is smooth with no vibration about 35. it uses the scooter drum brake for the rear and bike v brake front. i left the e start intact so i dont have to kick it.