Re: "Why you put an engine on your bicycle?" and best answer goes to...
Cheap transportation here. To save miles on my car too, since they're so much anexpensive carrot to replace. Marketing of automobiles is not fair to mechanics, oh I could go on.
Because I've always been a bike rider, and now can't do the mileage I want to otherwise, because of pain and stiffness. I don't like getting old...
I realized a whileago, after tinkering with these motor bikes for not quitea year: I still would rather just pedal my bike- I'm a tourist, a sight-seer, and I think a lot while riding. I almost put a topic up about it, but thought that might not fly with the motor purists. Don't want to be discouraging.
There's room in our lives for both pedalling and a motorbike. Culturally I like that it brings the motor size down from the power-oriented chopper crowd, and shows what can be practical and functional otherwise.