air suspension YAMAHA WR 250F 2014 Owners Manual

4-6
CHASSIS
CHANGE IN LEVEL AND
CHARACTERISTICS OF FORK OIL
Damping characteristic near the final
stroke can be changed by changing
the fork oil amount.
Adjust the oil level in 5 mm (0.2 in)
increments or decrements. Too
low oil level causes the front fork
to produce a noise at full rebound
or the rider to feel some pressure
on his hands or body. Alternative-
ly, too high oil level will develop
unexpectedly early oil lock with
the consequent shorter front fork
travel and deteriorated perfor-
mance and characteristics. There-
fore, adjust the front fork within
the specified range.
A. Air spring characteristics in
relation to oil level change
B. Load
C. Stroke
1. Max. oil level
2. Standard oil level
3. Min. oil levelADJUSTING THE SPRING
PRELOAD
The spring preload is adjusted by in-
stalling the adjustment washer "1" be-
tween the fork spring "2" and damper
rod "3".
Do not install three or more adjust-
ment washers for each front fork.
Always adjust each front fork to
the same setting. Uneven adjust-
ment can cause poor handling and
loss of stability.
A. Load
B. Fork stroke
1. Without adjustment washer
(standard)
2. 1 adjustment washer
3. 2 adjustment washers
SETTING OF SPRING AFTER
REPLACEMENT
As the front fork setting can be easily
affected by rear suspension, take
care so that the machine 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 damp-
ing.
Turn in one or two clicks.
Generally a soft spring gives a soft
riding feeling. Rebound damping
tends to become stronger and the
front fork may sink deeply over a se-
ries of gaps.
2. Use of stiff spring
• Change the rebound damping.
Turn in one or two clicks.
• Change the compression damp-
ing.
Turn out one or two clicks.
Generally a stiff spring gives a stiff
riding feeling. Rebound damping
tends to become weaker, resulting in
lack of a sense of contact with the
road surface or in a vibrating handle-
bar.
FRONT FORK SETTING PARTS
• Adjustment washer "1"
• Front fork spring "2"
The I.D. mark (slits) "a" is proved on
the end of the spring.
When using a spring with a spring
rate of 0.469 kg/mm, do not install
two or more adjustment washers
for each front fork.
Standard oil level:
132.0 mm (5.20 in)
Extent of adjustment:
95.0–150.0 mm (3.74–
5.91 in)
From top of outer tube
with inner tube and
damper rod fully com-
pressed without
spring.
Standard washer quanti-
ty:
Zero adjustment wash-
ers
Extent of adjustment:
Zero–2 adjustment
washers
TYPE (thick-
ness)PART NUMBER
T = 2.3 mm (0.09
in)5XE-23364-00
TYPESPRI
NG
RATESPRING
PART
NUMBER
(-23141-)I.D.
MARK
(slits)
SOFT0.408 5TJ-00 |
0.418 5TJ-10 ||
0.428 5TJ-20 |||
0.438 5TJ-30 ||||
STD 0.449 5TJ-A0 —
STIFF0.459 5TJ-50 |-|
0.469 5TJ-60 |-||

6-20
FRONT FORK
7. Install:
• Piston metal "1"
Install the piston metal onto the slot
on inner tube.
8. Install:
• Outer tube "1"
To inner tube "2".
9. Install:
• Slide metal "1"
• Oil seal washer "2"
To outer tube slot.
Press the slide metal into the outer
tube with fork seal driver "3".
10. Install:
• Oil seal "1"
Press the oil seal into the outer tube
with fork seal driver "2".
11. Install:
• Stopper ring "1"
Fit the stopper ring correctly in the
groove in the outer tube.
12. Install:
• Dust seal "1"
Apply the lithium soap base grease
on the inner tube.
13. Check:
• Inner tube smooth movement
Tightness/binding/rough spots →
Repeat the steps 2 to 12.14. Compress the front fork fully.
15. Fill:
• Front fork oil
Until outer tube top surface with
recommended fork oil "1".
• Be sure to use recommended
fork oil. If other oils are used,
they may have an excessively ad-
verse effect on the front fork per-
formance.
• Never allow foreign materials to
enter the front fork.
16. After filling, pump the damper rod
"1" slowly up and down more than
10 times to distribute the fork oil.
17. Fill:
• Front fork oil
Until outer tube top surface with
recom-mended fork oil once
more.
18. After filling, pump the outer tube
"1" slowly up and down (about
200 mm (7.9 in) stroke) to distrib-
ute the fork oil once more.
Be careful not to excessive full stroke.
A stroke of 200 mm (7.9 in) or more
will cause air to enter. In this case, re-
peat the steps 15 to 18.
Fork seal driver:
YM-A0948/90890-01502
Fork seal driver:
YM-A0948/90890-01502
Recommended oil:
Suspension oil "S1"