When I was a kid I got a bike to go about 65mph with a 10hp, that was before I realized the little rubber brake pads are not made for that speed, and is very hard to take a hand off the handle bars and fool around with a hot engine to try to get it turned off at 60. (I was only 12 and did not think things through to clearly.) I ended up peeling gravel out of my back for weeks. Be careful