2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 126Get this manual

2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 126

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CYLINDER HEADIV ALVECAMSHAFT

Compression too low, hard starting or poor performance at low speed
ValvesIncorrect valve adjustmentBurned or bent valveIncorrect valve timingWeak valve