...I've been a professional Bicycle Mechanic for about seven years now, but I never considered adding an engine til now. I've got about a 90 mile daily round trip commute on county roads. As a cyclist the engine would be used mostly as an assist to pedaling. My question is assuming proper maintinence is performed can these things handle that kind of use? Is there a specific kit I should be looking at, or are all pretty much the same quality?