I recently started tinkering with custom bikes, and love the idea of a motor. My question is how much power will be enough? I would like to have non-pedal assisted starts and power to get up hills, but only really want a 25mph or so top speed. The stretch cruiser I'm building will be pretty heavy and I'm a fat guy, so figure 280-300 combined bike and rider. Is a cheap, simple build out of the question? by the time I purchase everything will I be better off buying a cheap small displacement street bike? I was thinking a briggs and a jackshaft is about as complicated as I would want to tackle. I know there is no way to get something street legal that will do what I want in Oregon with their 32cc limit.