My buddy has a 1977 Garelli moped. When we got it the cylinder was rusted to the piston. We eventually ended up boring out the cylinder and buying a new piston. So we got a little more power out of it, nice. But for some reason it won't idle now, i guess it never idled anyways. We thought it was in the carb. We've taken it apart several times and cleaned it real good. Anybody have any ideas. Maybe you have to adjust some things that i am overlooking.