Yamaha YZ450F(B) 2012 Owner's Service Manual page 88

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"
• Pipe 1 "2"
Pipe 1:
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)
• O-ring "4"
• Pipe 2 "5"
Pipe 2:
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Radiator hose 3 "6"
Radiator hose 3:
2 Nm (0.2 m•kg, 1.4
ft•lb)
• Radiator hose 4 "7"
Radiator hose 4:
2 Nm (0.2 m•kg, 1.4
ft•lb)
2. Install:
• Grommet "1"
Face the smaller portion "a" of the
grommet inward.
3. Install:
• Radiator hose 2 "1"
Radiator hose 2:
2 Nm (0.2 m•kg, 1.4
ft•lb)
• Left radiator "2"
Left radiator:
10 Nm (1.0 m•kg, 7.2
ft•lb)
4. Install:
• Radiator breather hose "1"
• Right radiator "2"
Right radiator:
10 Nm (1.0 m•kg, 7.2
ft•lb)
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
4-7
RADIATOR
5. Install:
• Radiator guard "1"
First fit the inner hook portion "a" and
then the outer one "b" onto the radia-
tor.
6. Install:
• Bolt (radiator guard) "1"
Bolt (radiator guard) "1":
10 Nm (1.0 m•kg, 7.2
ft•lb)