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Yamaha YZ250F User Manual

Yamaha YZ250F
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SWINGARM
4-61
EAS1SM5186
REMOVING THE SWINGARM
1. Use a suitable stand to raise the rear wheel
off the ground.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Measure:
Swingarm side play
Swingarm vertical movement
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure the tightening torque of the pivot
shaft nut.
b. Measure the swingarm side play “a” by mov-
ing the swingarm from side to side.
c. If the swingarm side play is out of specifica-
tion, check the spacers, the bearings, and
the collars.
d. Check the swingarm vertical movement “b”
by moving the swingarm up and down.
If swingarm vertical movement is not smooth
or if there is binding, check the spacers, the
bearings, and the collars.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS1SM5187
REMOVING THE BEARING
1. Remove:
Bearing “1”
TIP
Remove the bearing by pressing its outer race.
EAS1SM5188
CHECKING THE SWINGARM
1. Check:
Swingarm
Bends/cracks/damage Replace.
2. Check:
Pivot shaft
Roll the pivot shaft on a flat surface.
Bends Replace.
EWA13770
WARNING
Do not attempt to straighten a bent pivot
shaft.
3. Wash with kerosene:
Pivot shaft
Spacers
•Collars
Bearing
4. Check:
Oil seals
Damage Replace.
Bearing
Spacers
Free play exists/unsmooth revolution/rust
Replace bearing and bushing as a set.
Pivot shaft nut
85 Nm (8.5 m·kgf, 61 ft·lbf)
Swingarm end free play limit (ra-
dial)
1.0 mm (0.04 in)
T
R
.
.

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Yamaha YZ250F Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0 mm x 53.6 mm
Final DriveChain
Suspension / RearKYB® single shock; fully adjustable, 12.5-in travel
Brakes / FrontHydraulic single disc brake, 270mm
Brakes / RearHydraulic single disc brake, 240mm
Fuel Capacity1.6 gal
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryFuel injection
IgnitionTCI
Transmission5-speed; multiplate wet clutch
Suspension / FrontKYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel
Tires / Front80/100-21

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