Yamaha YZ250(W)/W1, Owner'S Service Manual

Page: 572 / 596

7-14
SETTING
TUN
EC722011
Front fork setting
The front fork setting should be made depending
on the rider’s feeling of an actual run and the cir-
cuit conditions.
The front fork setting includes the following three
factors:
1. Setting of air spring characteristics
9 Change the fork oil amount.
2. Setting of spring preload
9 Change the spring.
3. Setting of damping force
9 Change the compression damping.
9
Change the rebound damping.
The spring acts on the load and the damp-
ing force acts on the cushion travel speed.
EC723001
Change in amount and characteristics of fork
oil
Damping characteristic near the final stroke can
be changed by changing the fork oil amount.
c C
Adjust the oil amount in 5 cm 3 (0.2 Imp oz,
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 performance and
characteristics. Therefore, adjust the front
fork within the specified range.
*For EUROPE
å
Air spring characteristics in relation to oil amount
change
∫
Load
ç
Stroke
1
Max. oil amount
2
Standard oil amount
3
Min. oil amount
Standard oil amount:
340 cm 3 (12.0 Imp oz, 11.5 US oz)
*345 cm 3 (12.1 Imp oz, 11.7 US oz)
Extent of adjustment:
300~380 cm 3 (10.6~13.4 Imp oz,
10.1~12.8 US oz)
A
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