2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 141Get this manual
COOLING SYSTEM RADIATOR CAPSYSTEM PRESSURE INSPECTION Before installing the cap in the tester, wet the sealing surfaces
Pressure test the radiator cap using the testerReplace the radiator cap if it does not hold pressure, or if relief pressure is too high or too lowIt must hold specified pressure for at least secondsRADIATOR CAP RELIEF PRESSURE: 108 137 kPa (1.1 1.4 kgfcm2, 16 20 psi)
RADIATOR CAP Pressure the radiator, engine and hoses using the tester, and check for leaks