Yamaha YZ250F(X) Owner's Service Manual page 73

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.
When the engine has cooled, open
the radiator cap by the following
procedure:
Place a thick rag, like a towel, over
the radiator cap, slowly rotate the
cap counterclockwise to the de-
tent. This procedure allows any re-
sidual pressure to escape. When
the hissing sound has stopped,
press down on the cap while turn-
ing counterclockwise and remove
it.
CHECKING THE RADIATOR
1. Inspect:
• Radiator core "1"
→
Obstruction Blow out with com-
pressed air through rear of the ra-
diator.
→
Bent fin Repair/replace.
INSTALLING THE RADIATOR
1. Install:
• O-ring "1"
• Radiator pipe 1 "2"
• Bolt (radiator pipe) "3"
Bolt (radiator pipe):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Apply the lithium soap base grease
on the O-ring.
2. Install:
• Radiator breather hose "1"
• Radiator hose 2 "2"
• Radiator hose 3 "3"
• Radiator hose 4 "4"
To right radiator "5".
3. Install:
• Right radiator "1"
• Bolt (right radiator) "2"
Bolt (right radiator):
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Radiator hose 3 "3"
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
4. Install:
• Left radiator "1"
• Bolt (left radiator) "2"
Bolt (left radiator):
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Radiator hose 1 "3"
Radiator hose 1:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
5. Tighten:
• Radiator hose clamp "4"
Radiator hose clamp:
2 Nm (0.2 m•kg, 1.4
ft•lb)
6. Install:
• Radiator guard "1"
First fit the inner hook portion "a" and
then the outer one "b" onto the radia-
tor.
4-6
RADIATOR