Removing The Rear Wheel; Checking The Rear Wheel; Disassembling The Rear Wheel; Checking And Replacing The Rear Wheel Sprocket - Yamaha YZ450F Owner's Service Manual

REMOVING THE REAR WHEEL

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1. Use a suitable stand to raise the rear wheel
off the ground.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Remove:
• Rear wheel axle nut "1"
3. Loosen:
• Locknut "2"
4. Tighten:
• Adjusting bolt "3"
5. Remove:
• Rear wheel axle
• Rear wheel
TIP
• Push the rear wheel forward and remove the
drive chain from the rear wheel sprocket.
• Do not depress the brake pedal with the rear
wheel removed.
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CHECKING THE REAR WHEEL

1. Check:
• Rear wheel axle
• Rear wheel
• Bearing
• Oil seals
Refer to "CHECKING THE FRONT WHEEL"
on page 4-4.
2. Check:
• Tire(s)
• Rear wheel
Damage/wear  Replace.
Refer to "CHECKING THE TIRES" on page
3-34 and "CHECKING THE WHEELS" on
page 3-34.
3. Check:
• Spokes
Refer to "CHECKING THE FRONT WHEEL"
on page 4-4.
4. Measure:
• Radial wheel runout
• Lateral wheel runout
Refer to "CHECKING THE FRONT WHEEL"
on page 4-4.

DISASSEMBLING THE REAR WHEEL

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1. Remove:
• Oil seals
• Bearing
Refer to "DISASSEMBLING THE FRONT
WHEEL" on page 4-5.
2 CHECKING AND REPLACING THE REAR
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WHEEL SPROCKET
1. Check:
• Rear wheel sprocket
3
More than 1/4 tooth wear "a"  Replace the
1
rear wheel sprocket and the drive sprocket
as a set.
Bent tooth  Replace the rear wheel
sprocket and the drive sprocket as a set.
b. Correct
1. Drive chain roller
2. Rear wheel sprocket
2. Replace:
• Rear wheel sprocket
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the self-locking nuts and the rear
wheel sprocket.
b. Clean the rear wheel drive hub with a clean
cloth, especially the surfaces that contact
the sprocket.
c. Install the new rear wheel sprocket.
4-8
REAR WHEEL
Radial wheel runout limit
2.0 mm (0.08 in)
Lateral wheel runout limit
2.0 mm (0.08 in)
Rear wheel sprocket self-locking
nut
42 Nm (4.2 m·kgf, 30 ft·lbf)