I am 69 years young and just got into building motorized bicycle to give me something to keep me from rusting. I am a retired Harley Davidson Service manager and mechanic. I retired in 1998. I have very little experience in working on bicycles. I do know engines and drive trains though and pretty good at electrical problems. I do appreciate advice on anything that is how you learn. And just remember it is not fixed until you find why it broke.