Checking The Radiator Cap; Checking The Radiator Cap Opening Pressure - Yamaha YZ450F Owner's Service Manual

5. Install:
• Copper washers
• Coolant drain bolt
Coolant drain bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
6. Pour coolant.
Recommended coolant
High quality ethylene glycol
anti-freeze containing anti-cor-
rosion for aluminum engine
Radiator capacity (including all
routes)
1.04 L (1.10 US qt, 0.92 Imp.qt)
Coolant mixing ratio
1:1 (Coolant:Water)
EWA13040
WARNING
• If coolant splashes in your eyes, thorough-
ly wash them with water and consult a
doctor.
• If coolant splashes on your clothes, quick-
ly wash it away with water and then with
soap and water.
• If coolant is swallowed, induce vomiting
and get immediate medical attention.
ECA13480
NOTICE
• Adding water instead of coolant lowers the
antifreeze content of the coolant. If water
is used instead of coolant check, and if
necessary, correct the antifreeze concen-
tration of the coolant.
• Use only distilled water. However, if dis-
tilled water is not available, soft water may
be used.
• If coolant comes into contact with painted
surfaces, immediately wash them with wa-
ter.
• Do not mix different types of antifreeze.
7. Install:
• Radiator cap
8. Start the engine, warm this up for several
minutes, stop it, and then wait for it to cool
down.
9. Check:
• Coolant level
Refer to "CHECKING THE COOLANT LEV-
EL" on page 3-8.

CHECKING THE RADIATOR CAP

EAS1SL5074
1. Check:
• Seal (radiator cap) "1"
New
• Valve and valve seat "2"
Crack/damage  Replace.
Exist fur deposits  Clean or replace.
CHECKING THE RADIATOR CAP OPENING
EAS1SL5075
PRESSURE
1. Check:
• Radiator cap opening pressure
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a. Install the radiator cap tester adapter "2" and
the radiator cap tester "3" to the radiator cap
"1," and activate the tester to check whether
it can stay for 5 to 10 seconds within stan-
dard pressure values.
TIP
Before attaching the cap to the tester, apply
water to its sealing surface.
Radiator cap opening pressure
108–137 kPa (1.08–1.37 kg/cm
15.7–19.9 psi)
No stay  Replace.
Radiator cap tester
90890-01325
Mityvac cooling system tester kit
YU-24460-A
Radiator cap tester adapter
90890-01352
Pressure tester adapter
YU-33984
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3-9
ENGINE
2
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