Yamaha YZ450FX 2019 Owner's Service Manual page 278

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HANDLING NOTE
EWA19360
WARNING
If coolant seems hot, do not remove the radi-
ator cap.
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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.
6-3
RADIATOR