Front Fork Setting; Change In Amount And Characteristics Of Fork Oil; Setting Of Spring After Replacement - Yamaha WR450FB 2012 Owner's Service Manual

• Under a stony or hard road condition, the tire
pressure should be higher to prevent a flat
tire.
Extent of adjustment:
100–120 kPa (1.0–1.2 kgf/
2
cm ,15–18 psi)
EAS1DX3128

FRONT 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.
• Change the rebound damping.
The spring acts on the load and the damping
force acts on the cushion travel speed.
EAS1DX3129
CHANGE 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 cm
0.2 US 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
328 cm (11.55 lmp.oz, 11.09 US
oz)
Extent of adjustment
295–370 cm
oz, 9.97–12.51 US oz)
3
(0.2 Imp oz,
3
(10.38–13.02 lmp.
4-2
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
EAS1DX3130
SETTING OF SPRING AFTER REPLACE-
MENT
As the front fork setting can be easily affected
by rear suspension, take care so that the ma-
chine front and rear are balanced (in position,
etc.) when setting the front fork.
1. Use of soft spring
• Change the rebound damping.
Turn out one or two clicks.
• Change the compression damping.
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.
Turn in one or two clicks.
• Change the compression damping.
Turn out one or two clicks.
CHASSIS