2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 143Get this manual
COOLING SYSTEM Install the radiator cap lid and tighten the screwSCREW RADIATOR CAP LID
RADIATOR CAP Fill the reserve tank to the upper level line with the vehicle on flat, level surfaceInstall the reserve tank capUPPER LEVEL LINE
RADIATOR RESERVE TANK
REMOVALINSTALLATION
Remove the reserve tank capRemove the trim clip, mounting bolt and reserve tankDisconnect the siphon hose from the reserve tank and drain the coolantInstall the reserve tank in the reverse order of removalFill the reserve tank to the upper level lineTANK CAP BOLT