Yamaha YZ450FY 2009 Owner's Service Manual page 72

Recommended coolant:
High quality ethylene glycol anti-
freeze containing anti-corrosion
for aluminum engine
Coolant "1" and water (soft water)
"2" mixing ratio:
50%/50%
Coolant capacity:
0.99 L (0.87 Imp qt, 1.05 US qt)
• 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:
110 kPa (1.1 kg/cm
3. Inspect:
• Pressure
Impossible to maintain the specified pres-
sure for 10 seconds → Replace.
3-7
ENGINE
2
, 15.6 psi)