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Discussion Starter · #1 ·
When I go on the bike for longer than 20 minutes the RPM gauge starts to surge, and occasionally the check engine light will come on. If I ride more spiritedly the RPM's seem to surge higher on the gauge. most of the time when there is a surge the motor stays constant, but the RPMs on the gauge will jump up to 3k higher. any idea what is causing this?
 

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Fuel idle trim (CO) set too low or a leak in your airbox or exhaust. Those are the places I would start looking.
 
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