Yamaha YZ450FA 2011 Owner's Service Manual page 121

HANDLING NOTE
Do not remove the radiator cap when the en-
gine and radiator are hot. Scalding hot fluid
and steam may be blown out under pres-
sure, which could cause serious injury.
When the engine has cooled, open the radi-
ator cap by the following procedure:
Place a thick rag, like a towel, over the radi-
ator cap, slowly rotate the cap counter-
clockwise to the detent. This procedure
allows any residual pressure to escape.
When the hissing sound has stopped, press
down on the cap while turning counter-
clockwise and remove it.
CHECKING THE RADIATOR
1. Inspect:
• Radiator core "1"
Obstruction → Blow out with compressed air
through rear of the radiator.
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 in-
ward.
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)
4-10
RADIATOR