Yamaha WR450F(R) Owner's Service Manual page 74

COOLING SYSTEM INSPECTION
3. Inspect:
EC357002
COOLING SYSTEM INSPECTION
1. Inspect:
2. Attach:
3. Apply the specified pressure.
NOTE:
Do not apply pressure more than specified
G
pressure.
Radiator should be filled fully.
G
4. Inspect:
3 - 9
INSP
Pressure
G
Impossible to maintain the specified
pressure for 10 seconds → Replace.
Coolant level
G
Radiator cap tester 1 and adapter 2
G
Radiator cap tester:
YU-24460-01/90890-01325
Adapter:
YU-33984/90890-01352
Standard pressure:
180 kPa (1.8 kg/cm
Pressure
G
Impossible to maintain the specified
pressure for 10 seconds → Repair.
Radiator
G
Radiator hose joint
G
Coolant leakage → Repair or replace.
Radiator hose
G
Swelling → Replace.
ADJ
2
, 25.6 psi)