1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 109Get this manual
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COOLING SYSTEM
COOLING SYSTEM TESTER (COMMERCIALLY AVAILABLE)
RADIATOR CAP RELIEF PRESSURE: 108-137 kPa (1.1-1.4 kgcm16-20 psi) Pressurize the radiator, engine and hoses, and check