2010 YAMAHA YZ250F radiator cap

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Page 55 of 196

YAMAHA YZ250F 2010  Owners Manual 3-5
PRE-OPERATION INSPECTION AND MAINTENANCE
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating condition.
Be

Page 56 of 196

YAMAHA YZ250F 2010  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 57 of 196

YAMAHA YZ250F 2010  Owners Manual 3-7
ENGINE
3. Radiator cap
2. Apply the specified pressure.
3. Inspect: • PressureImpossible to maintain the speci-
fied pressure for 10 seconds →
Replace.
CHECKING THE COOLING 
SYSTEM
1. Inspect:

Page 80 of 196

YAMAHA YZ250F 2010  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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