2007-2009 Honda TRX300EX TRX300X service manual, Page 117Get this manual

2007-2009 Honda TRX300EX TRX300X service manual, Page 117

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CYLINDER HEADVALVE

High compression can be caused by: carbon deposits in combustion chamber or on piston head

CYLINDER HEAD COVER REMOVAL
Remove he fuel tank (page 2-6)