Why won't my 250cc NST moped start?

Question

I recently had a small accident with it, but it worked fine after that. A couple days later it started smoking after an hour or so of riding it. It was also leaking a tiny amount of some fluid. (I'm not a mechanic I can't be sure what kind) Then it just died out on me when riding. I replaced the battery and put engine oil in it.

When I turn the key everything goes on, brake lights etc. But when I turn the key it doesn't start. I can hear something spinning in the engine, it kind of sounds like when you play with a remote control car but louder.

Answer 1

When you had your small accident, some oil probably leaked from the engine.  Then when the engine got hot enough, the oil started to burn off.  That was the smoke you saw.

The noise you here is probably the starter motor turning but for some reason it is not engaging with the engine.  You may have to find someone to help you with fixing your bike if you don't have the tools or experience to do it your self.