2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 206Get this manual

2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 206

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CYLINDER HEADVALVE Be careful not to damage the valve lifter bore
CAMSHAFTDECOMPRESSOR DISASSEMBLY
Remove the camshaft holder assembly (page 11-8)Remove the following:snap ringnut