Re: Custom bicycle with scooter engine
I can agree with Karolis, I've had the starter from a Piaggio apart, and they have to be kept clean and greased if they are to work at all, and the metal quality is not all that good. It isn't helped by the pedal shaft running directly in the nasty cheap monkey metal transmission casing, instead of a decent bushing.
I'm going to suggest something that is normally only used on bigger engines. An exhaust valve lifter, something that holds it open just enough for there to be no compression while the electric start is whizzing round, and then when the engine is fast enough, let the valve go to normal operation.