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Yamaha YZ250 2021 User Manual

Yamaha YZ250 2021
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CHASSIS
3-17
Adjusting the drive chain slack
WARNING
EWA13120
Securely support the vehicle so that there is
no danger of it falling over.
1. Adjust:
Drive chain slack
a. Loosen the wheel axle nut “1”.
b. Loosen both locknuts “2”.
c. Turn the adjusting bolt “3” until the speci-
fied drive chain slack is obtained.
TIP
To maintain the proper wheel alignment, adjust
both sides evenly.
Push the rear wheel forward to make sure that
there is no clearance between the swingarm
end plates and the ends of the swingarm.
d. Tighten the wheel axle nut.
e. Tighten the drive chain puller locknut.
EAM30251
LUBRICATING THE DRIVE CHAIN
The drive chain consists of many interacting
parts. If the drive chain is not maintained proper-
ly, it will wear out quickly. Therefore, the drive
chain should be serviced, especially when the
vehicle is used in dusty areas.
This vehicle has a drive chain with small rubber
O-rings between each side plate. Steam clean-
ing, high-pressure washing, certain solvents,
and the use of a coarse brush can damage
these O-rings. Therefore, use only kerosene to
clean the drive chain. Wipe the drive chain dry
and thoroughly lubricate it with engine oil or
chain lubricant that is suitable for O-ring chains.
Do not use any other lubricants on the drive
chain since they may contain solvents that could
damage the O-rings.
EAM30247
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Use a maintenance stand to raise the front
wheel off the ground.
WARNING
EWA13120
Securely support the vehicle so that there is
no danger of it falling over.
2. Check:
Steering head
Grasp the bottom of the front fork legs and
gently rock the front fork.
Blinding/looseness Adjust the steering
head.
3. Remove:
Handlebar
Upper bracket
4. Adjust:
Steering head
a. Remove the washer “1”.
b. After loosening the ring nut “2” with a
steering nut wrench “3”, tighten it to the
specified torque.
TIP
Set the torque wrench at a right angle to the
steering nut wrench.
Move the steering to the left and right a couple
of times to check that it moves smoothly.
Drive chain slack (Maintenance
stand)
48.0–58.0 mm (1.89–2.28 in)
Rear wheel axle nut
125 N·m (12.5 kgf·m, 92 lb·ft)
Drive chain puller locknut
19 N·m (1.9 kgf·m, 14 lb·ft)
2
1
3
T
R
.
.
T
R
.
.
Recommended lubricant
Chain lubricant suitable for O-
ring chains
1

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Yamaha YZ250 2021 Specifications

General IconGeneral
Engine Type249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke66.4mm x 72.0mm
Compression Ratio8.9~10.6:1
IgnitionCDI
Transmission5-speed; multiplate wet clutch
Final DriveChain
Suspension RearKYB® single shock; fully adjustable, 12.4-in travel
Brakes FrontHydraulic disc, 270mm
Tires Front80/100-21
Tires Rear110/90-19
Width32.5 in
Height50.8 in
Wheelbase58.5 in
Ground Clearance14.2 in
Fuel Capacity2.1 gal
Wet Weight227 lb
Fuel DeliveryKeihin PWK38S carburetor
Suspension FrontKYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Brakes RearHydraulic disc, 245mm

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