2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 203Get this manual

2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 203

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CYLINDER HEADVALVE
Low compression can be caused by:blown cylinder head gasketimproper valve adjustmentvalve leakageworn piston ring or cylinder High compression can be caused by:carbon deposits