Yamaha YTZ250S 1986 Service Manual page 89

Front fork setting
It is advisable to take a note of the standard
setting data and specified range of adjustment.
Fork oil level
The fork oil level in the fork tube is adjustable.
The change in the fork oil level will not affect
the damping force at the early stage of fork
travel, but it will have a great effect at the later
stage.
Recommended oil:
Fork oil 10 wt or SEA
#
10 fork oil
Oil quantity:
418 cm 3 (14.7 Imp
OZ,
13.9 US
OZ)
Oil level:
Std 180 mm (7.09 in)
MIN. 168 mm (6.61 in)
MAX. 212 mm (8.35 in)
(From top of inner tube fully compress-
ed without spring.)
• When the oil level is raised:
The air spring in the later half stage of
travel is stronger, and thus the front fork
is harder.
• When the oil level is lowered:
The air spring in the later half stage of
travel is lessened, and thus the front fork
is softer.
EX : 300
FORK STROKE
1. Increase level 2. Std oil level
3. Decrease level
4-10
Oil level adjustment
1. Place a suitable stand under the engine
to keep the front of machine raised off the
floor.
2. Remove the valve cap.
3. Using a slotted-head screwdriver, depress
the valve to allow the air to escape from
the fork legs.
4. Remove the cap bolt assembly. And
remove the short spring, washer, and long
spring.
5.
Measure the oil level from top of the fork
tube with oil level tool. The fork tubes
must be fully bottomed.
• To raise the oil level, once add oil and ad-
just the level to the desired position.
• To lower the oil level, it can be lowered
straight.
o
~
I
3
1. 0 point 2. Fork oil level 3.
Oil level tool
6. Inspect the a-ring on cap bolt and replace
if damaged.
1. O-ring