surging chain problems

Dennis Obert

New Member
Aug 24, 2008
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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?
 

mechanickid

New Member
Aug 7, 2008
419
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nh
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.
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
235
63
up north now
Yes, overtightening will make it worse. 3/4" of freeplay at the tightest point.

It sounds like you will have to remove the rear wheel and loosen/center/tighten the sprocket carefully keeping it centered as you go.

You may want to check and make sure the center hole in the sprocket is centered while you have it off.