Re: biggest motor/ hp with shift kit?
you can get a pulley from McMaster-Carr that changes pitch if you tighten the belt; its like a cvt but you control the ratio with a belt tensioner clutch. i plan on doing this once i finish my build 'cuz they cost over $100.
some people say that a motorbike defeats the purpose of a bike. i tell them to get a flintstone's car.