2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 122Get this manual

2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 122

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CYLINDER HEADVALVECAMSHAFT
Check that there is no leakage at the gauge connectionLow compression can be caused by:blown cylinder head gasketimproper valve adjustmentvalve leakageworn piston ring