Adjusting The Front Fork Legs; Bleeding The Hydraulic Clutch System - Yamaha VMX17YB 2009 Assembly Manual

• Use only the designated clutch fluid.
Other clutch fluids may cause the rub-
ber seals to deteriorate, causing leak-
age and poor clutch performance.
• Refill with the same type of clutch flu-
id that is already in the system. Mixing
clutch fluids may result in a harmful
chemical reaction, leading to poor
clutch performance.
• When refilling, be careful that water
does not enter the reservoir. Water
will significantly lower the boiling
point of the clutch fluid and could
cause vapor lock.
Clutch fluid may damage painted sur-
faces or plastic parts. Therefore, always
clean up any spilt clutch fluid immedi-
ately.
In order to ensure a correct reading of the
clutch fluid level, make sure that the top of
the reservoir is level.
a
4. Install:
• clutch master cylinder reservoir dia-
phragm
• clutch master cylinder reservoir dia-
phragm holder
• clutch master cylinder reservoir cap
M. BLEEDING THE HYDRAULIC
CLUTCH SYSTEM
Bleed the hydraulic clutch system
whenever:
• the system was disassembled,
• a clutch hose was loosened or re-
moved,
• the clutch fluid level is very low,
• clutch operation is faulty.
1. Remove:
• clutch release cylinder cover (1)
• Be careful not to spill any clutch fluid or
allow the clutch fluid reservoir to over-
flow.
• When bleeding the hydraulic clutch sys-
tem, make sure that there is always
enough clutch fluid before applying the
clutch lever. Ignoring this precaution
could allow air to enter the hydraulic
clutch system, considerably lengthening
the bleeding procedure.
• If bleeding is difficult, it may be neces-
sary to let the clutch fluid settle for a few
hours. Repeat the bleeding procedure
when the tiny bubbles in the hose have
disappeared.
2. Bleed:
• hydraulic clutch system
a. Add the recommended clutch fluid to
the proper level.
b. Install the clutch fluid reservoir dia-
phragm.
c. Connect a clear plastic hose (1) tightly
to the bleed screw (2).
UPPER
LOWER
d. Place the other end of the hose into a
container.
e. Slowly squeeze the clutch lever sever-
al times and release it.
f. Fully squeeze the clutch lever and do
not release it.
g. Loosen the bleed screw. This will re-
lease the tension and cause the clutch
lever to contact the handlebar grip.
h. Tighten the bleed screw and then re-
lease the clutch lever.
i. Repeat steps (e) to (h) until all of the air
bubbles have disappeared from the
clutch fluid in the plastic hose.
j. Tighten the bleed screw to specifica-
tion.
Bleed screw
5 Nm (0.5 m•kg, 3.6 ft•lb)
k. Add the recommended clutch fluid to
the proper level.
Refer to "CHECKING THE CLUTCH
FLUID LEVEL".
After bleeding the hydraulic clutch sys-
tem, check the clutch operation.
3. Install:
• clutch release cylinder cover
Clutch release cylinder cover bolt
10 Nm (1.0 m•kg, 7.2 ft•lb)
1
1
2
-14-
N. ADJUSTING THE FRONT FORK
LEGS
The following procedure applies to both of
the front fork legs.
• Always adjust both front fork legs
evenly. Uneven adjustment can result
in poor handling and loss of stability.
• Securely support the vehicle so that
there is no danger of it falling over.
Spring preload
• Grooves are provided to indicate the
adjustment position.
• Never go beyond the maximum or
minimum adjustment positions.
1. Adjust:
• spring preload
a. Turn the adjusting bolt (1) in direction
(a) or (b).
Direction (a)
Spring preload is increased (suspen-
sion is harder).
Direction (b)
Spring preload is decreased (suspen-
sion is softer).
1
a
b
Adjusting positions
Standard: 4
Minimum: 5
Maximum: 1
1
3 2
5 4
Rebound damping
Never go beyond the maximum or mini-
mum adjustment positions.
1. Adjust:
• rebound damping
a. Turn the adjusting screw (1) in direc-
tion (a) or (b).