2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 197Get this manual
CYLINDERPISTON Remove the sealing bolt and washer from the cam chain tensioner lifterTurn the cam chain tensioner lifter shaft clockwise fully to retract the tensioner lifter and secure it with stopper toolTOOL: Cam chain tensioner stopper 07NMG-MY90101 or 07ZMG-MCAA400 (U.S.Aonly) TENSIONER LIFTER
Install the cam chain tensioner lifter into the cylinder with new gasket