Checking The Radiator; Installing The Radiator - Yamaha YZ250 Owner's Service Manual

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:
• Radiator breather hose "1"
• Radiator hose 2 "2"
Radiator hose 2:
2 Nm (0.2 m•kg, 1.4
ft•lb)
To right radiator "3".
2. Install:
• Right radiator "1"
• Washer "2"
• Bolt (right radiator) "3"
Bolt (right radiator):
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Radiator hose 4 "4"
Radiator hose 4:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
3. Install:
• Left radiator "1"
• Washer "2"
• Bolt (left radiator) "3"
Bolt (left radiator):
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Radiator hose 1 "4"
Radiator hose 1:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
4. Tighten:
• Radiator hose clamp 2 "5"
Radiator hose clamp 2:
2 Nm (0.2 m•kg, 1.4
ft•lb)
5. Install:
• Radiator guard "1"
• Bolt (radiator guard) "2"
Bolt (radiator guard):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Fit the hook "a" on the inner side first
into the radiator.
4-6
RADIATOR