I have a problem with my Scwinn Cruser with a 2 stroke Chinese 80cc egine. The bike continually surges in a jerking motion. The engine runs smoth, I have tigtened th chain without any improvement. Any suggestions?
the chain needs to be a little lose. and make sure your chain stay isn't twisting towards the wheel causing the chain to jump off. adding a metal piece that extends to the other side of the fork will help if thats the problem.