Re: i have a idea
Are you thinking of building an electric powered bike?
I'm a big cheapskate and all for doing things on a budget so I understand your point. But if you get it used from a yard it may not work either. If stuff is new and you don't grind or modify it you can at least return it, say it didn't work and get a refund. Unless of course you own the junk yard or have free access to it then go nuts of course.
McGyver could fix that with bubble gum.