Yamaha YZ450F Owner's Service Manual page 63

CHECKING THE RADIATOR CAP
OPENING PRESSURE
1. Attach:
• Radiator cap tester "1" and adapt-
er "2"
Radiator cap tester:
YU-24460-01/90890-
01325
Radiator cap tester
adapter:
YU-33984/90890-01352
Apply water on the radiator cap seal.
3. Radiator cap
2. Apply the specified pressure.
Radiator cap opening
pressure:
108–137 kPa (1.08–1.37
2
kg/cm , 15.4–19.5 psi)
3. Inspect:
• Pressure
Impossible to maintain the speci-
fied pressure for 10 seconds →
Replace.
CHECKING THE COOLING
SYSTEM
1. Inspect:
• Coolant level
2. Attach:
• Radiator cap tester "1" and adapt-
er "2"
Radiator cap tester:
YU-24460-01/90890-
01325
Radiator cap tester
adapter:
YU-33984/90890-01352
3. Apply the specified pressure.
Standard pressure:
196 kPa (1.96 kg/cm
27.9 psi)
• Do not apply pressure more than
specified pressure.
• Radiator should be filled fully.
4. Inspect:
• Pressure
Impossible to maintain the speci-
fied pressure for 10 seconds →
Repair.
• Radiator
• Radiator hose joint
Coolant leakage → Repair or re-
place.
• Radiator hose
Swelling → Replace.
ADJUSTING THE CLUTCH LEVER
POSITION
1. Adjust:
• Clutch lever position
Clutch lever position adjustment
steps:
a. Loosen the locknuts "1".
b. Turn the adjusting bolt "2" until the
clutch lever position "a" is in the
desiered position .
c. Tighten the locknuts.
Locknut:
5 Nm (0.5 m•kg, 3.6
ft•lb)
2. Adjust:
• Clutch cable free play
Refer to "ADJUSTING THE
CLUTCH CABLE FREE PLAY".
3-7
ADJUSTING THE CLUTCH CABLE
FREE PLAY
1. Check:
2
,
• Clutch lever free play "a"
Out of specification → Adjust.
Clutch lever free play "a"
:
7–12 mm (0.28–0.47 in)
2. Adjust:
• Clutch lever free play
Clutch lever free play adjustment
steps:
a. Loosen the locknuts "1".
b. Turn the adjuster "2" until free
play "a" is within the specified lim-
its.
c. Tighten the locknuts.
Locknut:
4 Nm (0.4 m•kg, 2.9
ft•lb)
• Before adjustment, expose the ad-
juster by moving the boot "3" and
cap "4" away.
• Make minute adjustment on the le-
ver side using the adjuster "5".
• After adjustment, check proper op-
eration of clutch lever.
3. Install:
• Cap "1"
• Boot "2"
ENGINE