flat tire YAMAHA YZ250F 2014 Owners Manual

CHASSIS
3-32
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Low compression dampingECA13590
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Adjust:
• Low compression damping
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a. Turn the adjuster “1” in the direction of “a” or
“b” to make an adjustment.
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EAS1SM1107CHECKING THE TIRES
1. Measure:
• Tire pressure
Out of specification  Regulate.
TIP
• Check the tire while it is cold.
• Loose bead stoppers allow the tire to slip off
its position on the rim when the tire pressure
is low.
• If the tire valve stem is found tilted, the tire is
considered to be slipping off its position. Cor-
rect the tire position.
EAS1SM1108CHECKING AND TIGHTENING THE
SPOKES
1. Check:
• Spokes
Bend/damage  Replace.
Loose  Tighten.
TIP
A tight spoke will emit a clear, ringing tone; a
loose spoke will sound flat. Direction “a”
Low compression damping force is in-
creased (suspension is harder).
Direction “b”
Low compression damping force is de-
creased (suspension is softer).
Low compression damping
Maximum
Turn it in finger-tight.
STD
Turn it out by 10 clicks.*
Minimum
Turn it out by 20 clicks.*
* With the adjuster fully turned in
1
a b
1ba
Tire pressure
100 kPa (1.0 kgf/cm2,15 psi)

FRONT WHEEL
4-4
EAS1SM1123REMOVING THE FRONT WHEEL
1. Use a suitable stand to raise the front wheel
off the ground.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Remove:
• Front wheel
EAS1SM1124CHECKING THE FRONT WHEEL
1. Check:
• Front wheel axle
Roll the front wheel axle on a flat surface.
Bends  Replace.
EWA13460
WARNING
Do not use a bent front wheel axle even after
correcting this.
2. Check:
•Tire (s)
• Front wheel
Damage/wear  Replace.
Refer to “CHECKING THE TIRES” on page
3-32 and “CHECKING THE WHEELS” on
page 3-33.
3. Check:
• Spokes
Bend/damage  Replace.
Loose  Tighten.
Tap the spokes with a screwdriver.
TIP
A tight spoke will emit a clear, ringing tone; a
loose spoke will sound flat.
4. Tighten:
• Spokes
Refer to “CHECKING AND TIGHTENING
THE SPOKES” on page 3-32.
TIP
After tightening the spokes, measure the wheel
runout.
5. Measure:
• Wheel radial runout “a”
• Wheel lateral runout “b”
Out of specification  Repair/replace.
6. Check:
•Collars
Damage/wear  Replace.
7. Check:
• Bearing
Front wheel turns roughly or is loose  Re-
place the wheel bearings.
• Oil seals
Damage/wear  Replace.
Spokes
2.5 Nm (0.25 m·kgf, 1.8 ft·lbf)
Radial wheel runout limit
2.0 mm (0.08 in)
Lateral wheel runout limit
2.0 mm (0.08 in)
T R..
ab

CHASSIS
10-2
TIRE PRESSURE
Tire pressure should be adjusted to suit the
road surface condition of the circuit.
• Under a rainy, a muddy, a sandy, or a slippery
condition, the tire pressure should be lower
for a larger area of contact with the road sur-
face.
• Under a stony or a hard road condition, the
tire pressure should be higher to prevent a flat
tire.
EAS1SM1370FRONT FORK SETTING
The front fork setting should be made depend-
ing on the rider’s feeling of an actual run and
the circuit conditions.
The front fork setting includes the following
three factors:
1. Setting of air spring characteristics
• Change the fork oil amount.
2. Setting of spring preload
• Change the spring.
3. Setting of damping force
• Change the compression damping force.
• Change the rebound damping force.
The spring acts on the load and the damping
force acts on the cushion travel speed.
EAS1SM1371CHANGE IN AMOUNT AND CHARACTERIS-
TICS OF FORK OIL
Damping characteristic near the final stroke
can be changed by changing the fork oil
amount.
EWA1DX4001
WARNING
Adjust the oil amount in 5 cm3 (0.2 US oz,
0.2 Imp.oz) increments or decrements. Too
small oil amount causes the front fork to
produce a noise at full rebound or the rider
to feel some pressure on his hands or body.
Alternatively, too large oil amount will
cause the air spring characteristics to have
a tendency to be stiffer with the consequent
deteriorated performance and characteris-
tics. Therefore, adjust the front fork within
the specified range.
EAS1SM1372
Standard tire pressure
100 kPa (1.0 kgf/cm2,15 psi)
Extent of adjustment
60–80 kPa (0.6–0.8 kgf/cm
2, 9.0–
12 psi)
Extent of adjustment
100–120 kPa (1.0–1.2 kgf/cm
2,
15–18 psi)
Standard oil amount
330 cm3 (11.16 US oz, 11.64
lmp.oz) (USA) (CAN)
355 cm
3 (12.00 US oz, 12.52
lmp.oz) (EUR) (JPN) (AUS) (NZL)
(ZAF)
Extent of adjustment
300–365 cm
3 (10.14–12.34 US
oz, 10.58–12.87 Imp.oz)
A. Air spring characteristics in relation to oil
amount change
B. Load
C. Stroke
1. Max. oil amount
2. Standard oil amount
3. Min. oil amount