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there is no adjustments for timing, you can set the cam gear and crank gear but you should not have to unless you had it apart, if you did have it apart yo uhave to line the T on the flywheel the fan blade is on with the mark on the engine block, make sure the bog hole on the cam gear is facing the front of the scooter and the 2 small holes are even with the block on both sides.

the CDI controls timing advance and performance ones are available pretty cheap.

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10y ago
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Q: How do you adjust timing on gy6 engine?
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