Yamaha YZ450FA 2011 Owner's Service Manual page 79

• Do not mix more than one type of ethylene
glycol antifreeze containing corrosion in-
hibitors for aluminum engine.
• Do not use water containing impurities or
oil.
Handling notes of coolant:
The coolant is harmful so it should be handled
with special care.
• When coolant splashes to your eye.
Thoroughly wash your eye with water and
see your doctor.
• When coolant splashes to your clothes.
Quickly wash it away with water and then
with soap.
• When coolant is swallowed.
Quickly make him vomit and take him to a
doctor.
7. Install:
• Radiator cap
Start the engine and warm it up for a several
minutes.
8. Check:
• Coolant level
Coolant level low → Add coolant.
CHECKING THE RADIATOR CAP
1. Inspect:
• Seal (radiator cap) "1"
• Valve and valve seat "2"
Crack/damage → Replace.
Exist fur deposits "3" → Clean or replace.
CHECKING THE RADIATOR CAP OPENING
PRESSURE
1. Attach:
• Radiator cap tester "1" and adapter "2"
Radiator cap tester:
YU-24460-01/90890-01325
Radiator cap tester adapter:
YU-33984/90890-01352
Apply water on the radiator cap seal.
3. Radiator cap
2. Apply the specified pressure.
Radiator cap opening pressure:
108–137 kPa (1.08–1.37 kg/cm
15.4–19.5 psi)
3. Inspect:
• Pressure
Impossible to maintain the specified pres-
sure for 10 seconds → Replace.
3-8
ENGINE
2
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