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YZ250F 2009 yz250f Problem

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Motor is installed on a QRC caged kart for dirt oval racing. Driver is 11yrs old and new to this motor. Driver does hack the throttle during the race. He has never hit the rev limiter. Last Saturday was very humid and track was a dust bowl. I use K/N air filter with dust cover. The dust cover was totally covered in dust. The main filter looked good. My son told me that with 3 laps to go the motor would stop and then regain full power.  Any thoughts. Thanks


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