2009 YAMAHA YZ250F radiator cap

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Page 52 of 190

YAMAHA YZ250F 2009  Owners Manual 3-6
ENGINE
ENGINE
CHECKING THE COOLANT LEVEL
Do not remove the radiator cap 
"1", drain bolt and hoses when the 
engine and radiator are hot. Scald-
ing hot fluid and steam may be 
blown out under pre

Page 53 of 190

YAMAHA YZ250F 2009  Owners Manual 3-7
ENGINE
3. Radiator cap
2. Apply the specified pressure.
3. Inspect:
•Pressure
Impossible to maintain the speci-
fied pressure for 10 seconds→
Replace.
CHECKING THE COOLING 
SYSTEM
1. Inspect:

Page 76 of 190

YAMAHA YZ250F 2009  Owners Manual 4-6
RADIATOR
HANDLING NOTE
Do not remove the radiator cap 
when the engine and radiator are 
hot. Scalding hot fluid and steam 
may be blown out under pressure, 
which could cause serious injury. 
Whe
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