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Yamaha YZ250 2021 User Manual

Yamaha YZ250 2021
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CHASSIS
3-23
TIP
Although the total number of clicks of a damping
force adjusting mechanism may not exactly
match the above specifications due to small dif-
ferences in production, the actual number of
clicks always represents the entire adjusting
range. To obtain a precise adjustment, it would
be advisable to check the number of clicks of
each damping force adjusting mechanism and
to modify the specifications as necessary.
EAM30240
CHECKING THE SWINGARM OPERATION
1. Check:
Swingarm smooth action
Swingarm free play
Refer to “SWINGARM” on page 4-28.
EAM30500
LUBRICATING THE SWINGARM PIVOT
1. Lubricate:
Oil seal
Collar
EAM30243
CHECKING THE TIRES
1. Measure:
Tire pressure
Out of specification Regulate.
TIP
Check the tire while it is cold.
Because if the bead stopper tightening nut is
loose when the tire pressure is low, the tire
could slip off the rim, thus be sure to check and
tighten the bead stopper tightening nut “a”.
If the tire valve stem “b” is found tilted, the tire
is considered to be slipping off its position. Cor-
rect the tire position.
EAM30244
CHECKING AND TIGHTENING THE SPOKES
1. Check:
Spoke
Bend/damage Replace.
Loose Tighten.
TIP
A tight spoke will emit a clear, ringing tone; a
loose spoke will sound flat.
2. Tighten:
Spoke
(with a spoke nipple wrench “1”)
Slow compression damping
Minimum (soft)
20 click(s) in direction “b”*
Standard
12 click(s) in direction “b”*
Maximum (hard)
0 click(s) in direction “b”*
* With the adjusting screw fully turned in di-
rection “a”
Recommended lubricant
Lithium-soap-based grease
Tire air pressure (measured on
cold tires)
Front
100 kPa (1.00 kgf/cm², 15 psi)
Rear
100 kPa (1.00 kgf/cm², 15 psi)
a. Bead stopper tightening nut
b. Tire valve stem
a
b
G089059

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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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