Yamaha YZ250F(W) Owner's Service Manual page 652

SETTING
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.
Change in amount and characteristics of
fork oil
Damping characteristic near the final stroke
can be changed by changing the fork oil
amount.
CAUTION:
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 con-
sequent deteriorated
characteristics. Therefore, adjust the front
fork within the specified range.
Standard oil amount:
340 cm
(12.0 Imp oz, 11.5 US oz)
Extent of adjustment:
300 ~ 380 cm
(10.6 ~ 13.4 Imp oz,
10.1 ~ 12.8 US oz)
È Air spring characteristics in relation to oil amount
change
É Load
Ê Stroke
1 Max. oil amount
2 Standard oil amount
3 Min. oil amount
7 - 13
T U N
3
(0.2 Imp oz,
performance
3
3
and