2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 178Get this manual
CYLINDER HEADVALVECAMSHAFT Turn the cam chain tensioner lifter shaft clockwise fully and secure it with stopper toolTOOL: Cam chain tensioner stopper 07NMG-MY90101 or 07ZMG-MCAA400 (U.S.Aonly)
STOPPER TOOL Remove the four camshaft holder boltsRaise the camshaft holder plate so that the dowel pins fitted in the camshaft holders are removed from the cylinderRemove the cam chain from the cam sprocket, and suspend the cam chain with piece of wire to prevent it from falling into the crankcase Remove the camshaft assembly and holder plate