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I've been messing with a china 110cc trying to get it to run right. It's been a backup bike and has run ok-ish kinda off and on for the last few years. Hasn't done squat this year though.



I looked at the timing and noticed that the when the "T" is lined up, the circle on the cam gear is still a little high. Like it hasn't turned all the way to the front of the engine quite yet. Bad rotor? Bad install? Is this advancing the timing too much?



The timing has never been messed with, but I'm not looking at doing any performance timing with a backup buddy bike.



Thanks!
 

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High is retarded, and usually just production tolerances, or the $3 cam chain has stretched out. A decent DID for $20-ish will put the cam back in it's place most of the time. Or you can slot the sprocket and rotate the cam forward manually. Double-check the flywheel hasn't sheared the key, first, though.
 
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