Looking Low Weight Engine Kit
I would like to build a motorized bicycle (probably a mountain bike, but maybe a road bike) with a low weight engine, so the bike is light enough to pedal for exercise and offroad trails if I go with a mountain bike (i.e. not move at a crawl), and then motor back home (on the street). I am looking for the engine to give me some extra range.
However, I'm not finding any information on the weight of these kits. The manufacturers seem to omit it (or hide it pretty well). I am also looking for something very reliable, low maintenance, and reasonbly quiet. In other words, I'd rather pay more for good quality, than fix it all the time.