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Yamaha yz450f 2012 Service Manual

Yamaha yz450f 2012
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5-3
FRONT WHEEL AND REAR WHEEL
HANDLING NOTE
Support the machine securely so
there is no danger of it falling over.
REMOVING THE REAR WHEEL
1. Remove:
Wheel "1"
Push the wheel forward and remove
the drive chain "2".
REMOVING THE WHEEL BEARING
1. Remove:
Bearing "1"
Remove the bearing using a general
bearing puller "2".
CHECKING THE WHEEL
1. Measure:
Wheel runout
Out of limit Repair/replace.
2. Inspect:
•Bearing
Rotate inner race with a finger.
Rough spot/seizure Replace.
Replace the bearings, oil seal and
wheel collar as a set.
CHECKING THE WHEEL AXLE
1. Measure:
Wheel axle bends
Out of specification Replace.
Use the dial gauge "1".
The bending value is shown by one
half of the dial gauge reading.
Do not attempt to straighten a bent
axle.
CHECKING THE BRAKE DISC
1. Measure:
Brake disc deflection (only rear
brake disc)
Use the dial gauge "1".
Out of specification Inspect
wheel runout.
If wheel runout is in good condi-
tion, replace the brake disc.
2. Measure:
Brake disc thickness "a"
Out of limit Replace.
INSTALLING THE FRONT WHEEL
1. Install:
Bearing (left) "1"
Spacer "2"
Bearing (right) "3"
Oil seal "4"
Apply the lithium soap base grease
on the bearing and oil seal lip when
installing.
Use a socket that matches the out-
side diameter of the race of the
bearing.
Left side of bearing shall be in-
stalled first.
Install the oil seal with its manufac-
ture's marks or numbers facing out-
ward.
Do not strike the inner race of the
bearing. Contact should be made
only with the outer race.
Wheel runout limit:
Radial "1": 2.0 mm
(0.08 in)
Lateral "2": 2.0 mm
(0.08 in)
Wheel axle bending limit:
0.5 mm (0.020 in)
Brake disc deflection lim-
it:
Rear:
<Limit>: 0.15 mm
(0.006 in)
Brake disc thickness:
Front:
3.0 mm (0.12 in)
<Limit>: 2.5 mm (0.10
in)
Rear:
4.0 mm (0.16 in)
<Limit>: 3.5 mm (0.14
in)

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Yamaha yz450f 2012 Specifications

General IconGeneral
Bore x Stroke97.0mm x 60.8mm
Compression Ratio12.5:1
Fuel DeliveryFuel Injection
Transmission5-speed
Final DriveChain
Tires Front80/100-21
Tires Rear120/80-19
Wheelbase58.7 in
Trail4.6 in
Fuel Capacity1.6 gal
Wet Weight245 lb
Engine TypeLiquid-cooled, 4-stroke, DOHC, 4-valve
IgnitionTCI
Suspension FrontTelescopic fork, 12.2 in travel
Suspension RearSwingarm, 12.4 in travel
Brakes FrontHydraulic single disc brake, 250mm
Brakes RearSingle disc, 245 mm

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