I have a 150cc Chinese scooter. It ran great tell my exhaust broke. I drove it less than 25 miles without an exhaust. Winter has passed so now im trying to get it in good shape. Ive done valve adjustments, bought a new exhaust and made sure it had no leaks. Ive fucked with my air fuel mixture screw as much as possible as still having backfire on deceleration. Could i have blown a valve or something? Or any ideas?
It runs great has no other issues other than backfires on decel and flames shoot out. And how bad is it to run my moped like that?