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Yamaha YZ250F 2008 Service Manual

Yamaha YZ250F 2008
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5-35
SWINGARM
INSTALLING THE SWINGARM
1. Install:
Bushing "1"
Thrust bearing "2"
•Oil seal "3"
•Collar "4"
To swingarm "5".
Apply the molybdenum disulfide
grease on the bushings, thrust bear-
ings, oil seal lips and contact surfaces
of the collar and thrust bearing.
2. Install:
•Collar "1"
Washer "2"
To relay arm "3".
Apply the molybdenum disulfide
grease on the collars and oil seal lips.
3. Install:
•Collar "1"
To connecting rod "2".
Apply the molybdenum disulfide
grease on the collar and oil seal lips.
4. Install:
Connecting rod "1"
Bolt (connecting rod) "2"
•Washer "3"
Nut (connecting rod) "4"
To relay arm "5".
Apply the molybdenum disulfide
grease on the bolt.
5. Install:
Relay arm "1"
Bolt (relay arm) "2"
•Washer "3"
Nut (relay arm) "4"
To swingarm.
Apply the molybdenum disulfide
grease on the bolt circumference
and threaded portion.
Do not tighten the nut yet.
6. Install:
Swingarm "1"
Pivot shaft "2"
Apply the molybdenum disulfide
grease on the pivot shaft.
Insert the pivot shaft from right side.
7. Check:
Swingarm side play "a"
Free play exists
Replace thrust
bearing.
Swingarm up and down move-
ment "b"
Unsmooth movement/binding/
rough spots
Grease or replace
bearings, bushings and collars.
8. Install:
Bolt (connecting rod) "1"
Washer "2"
Nut (connecting rod) "3"
Apply the molybdenum disulfide
grease on the bolt.
Do not tighten the nut yet.
9. Install:
Bolt (rear shock absorber-relay
arm) "1"
Nut (rear shock absorber-relay
arm) "2"
Apply the molybdenum disulfide
grease on the bolt.
10. Tighten:
Nut (connecting rod) "1"
Nut (connecting rod):
80 Nm (8.0 m•kg, 58
ft•lb)
Pivot shaft:
85 Nm (8.5 m•kg, 61
ft•lb)
Nut (rear shock absorb-
er-relay arm):
53 Nm (5.3 m•kg, 38
ft•lb)
Nut (connecting rod):
80 Nm (8.0 m•kg, 58
ft•lb)

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Yamaha YZ250F 2008 Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0 x 53.6mm
Compression Ratio13.5:1
IgnitionCDI
Transmission5-speed
Final DriveChain
Front Tire80/100-21
Rear Tire100/90-19
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryCarburetor
Front Suspension48mm inverted fork, fully adjustable
Rear Suspensionfully adjustable
Front BrakesSingle disc, 250mm
Rear BrakesHydraulic single disc

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