Checking The Radiator; Installing The Radiator - Yamaha YZ450F 2020 Owner's Service Manual

EAM30341

CHECKING THE RADIATOR

1. Check:
• Radiator fins "1"
Obstructions  Clean.
Apply compressed air to the rear of the radia-
tor.
Damage  Repair or replace.
TIP
Correct any flattened fins with a thin, flat-head
screwdriver.
2. Check:
• Radiator hoses
• Radiator pipes
Crack/damage  Replace.
3. Check:
• Radiator cap valve opening pressure
a. Install the radiator cap tester adapter "2"
and the radiator cap tester "3" to the radi-
ator cap "1", and activate the tester to
check whether it can stay for 5 to 10 sec-
onds within standard pressure values.
TIP
Before attaching the cap to the tester, apply wa-
ter to its sealing surface.
Radiator cap valve opening pres-
sure
107.9–137.3 kPa (1.08–1.37
kgf/cm², 15.6–19.9 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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INSTALLING THE RADIATOR

1. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" on
page 3-21.
2. Check:
• Cooling system
Leaks  Repair or replace any faulty part.
3. Install:
• Radiator cap tester "1"
• Radiator cap tester adapter "2"
Radiator cap tester
90890-01325
Mityvac cooling system tester kit
YU-24460-A
Radiator cap tester adapter
90890-01352
Pressure tester adapter
YU-33984
4. Activate the tester to apply the test pressure.
Test pressure value
137.3 kPa (1.37 kgf/cm
ECA24270
NOTICE
• Do not apply such a high pressure as ex-
ceeds the test pressure.
• Make sure that a checkup after the cylinder
6-4
RADIATOR
2
, 19.9 psi)