Front Fork Setting; Change In Amount And Characteristics Of Fork Oil; Setting Of Spring After Replacement - Yamaha WR250F 2016 Owner's Service Manual

• Under a stony or a hard road condition, the
tire pressure should be higher to prevent a flat
tire.
Extent of adjustment
100–120 kPa (1.00–1.20 kgf/cm
15–18 psi)

FRONT FORK SETTING

EAS2GB7140
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.
EAS2GB7141 CHANGE IN AMOUNT AND CHARACTERIS-
TICS OF FORK OIL
Damping characteristic near the final stroke
can be changed by changing the fork oil
amount.
EWA
WARNING
Adjust the oil amount in 5 cm
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.
Standard oil amount
3
340 cm
lmp.oz)
Extent of adjustment
300–365 cm
oz, 10.58–12.87 Imp.oz)
3
(0.2 US oz,
(11.50 US oz, 11.99
3
(10.14–12.34 US
2
,
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
SETTING OF SPRING AFTER REPLACE-
EAS2GB7142
MENT
As the front fork setting can be easily affected
by the rear suspension, take care so that the
front and the rear are balanced (in position etc.)
when setting the front fork.
1. Use of soft spring
• Change the rebound damping force.
Turn out one or two clicks.
• Change the compression damping force.
Turn in one or two clicks.
TIP
Generally a soft spring gives a soft riding feel-
ing. Rebound damping tends to become stron-
ger and the front fork may sink deeply over a
series of gaps.
2. Use of stiff spring
• Change the rebound damping force.
Turn in one or two clicks.
• Change the compression damping force.
Turn out one or two clicks.
4-2
CHASSIS