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How to set the timing on sunl 90cc atv - Motorcycles

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SOURCE: i just rebuilt the top end on my daughters 90cc

Sounds like the valves are not set correctly. It is likely the intake valve is set too tight. Set the clearance at 5 to 6 thousandths. The exhaust should set at 8 to 10 thousandths. Check the timing with a timing light if you already haven't done it. If the valve clearance and ignition timing look okay, recheck the cam gear timing.

Posted on Feb 23, 2010

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Sounds like the valves are not set correctly. It is likely the intake valve is set too tight. Set the clearance at 5 to 6 thousandths. The exhaust should set at 8 to 10 thousandths. Check the timing with a timing light if you already haven't done it. If the valve clearance and ignition timing look okay, recheck the cam gear timing.

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