Yamaha WR125R 2009, Service Manual

Page: 101 / 372

CHASSIS
3-20
TIP
Loosening the bleed screw will release the pres-
sure and cause the brake lever to contact the
throttle grip or the brake pedal to fully extend.
h. Tighten the bleed screw, and then release
the brake lever or brake pedal.
i. Repeat steps (e) to (h) until all of the air bub-
bles have disappeared from the brake fluid in
the plastic hose.
j. Tighten the bleed screw to specification.
k. Fill the brake master cylinder reservoir or
brake fluid reservoir to the proper level with
the recommended brake fluid.
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-17.
WARNING
EWA13110
After bleeding the hydraulic brake system,
check the brake operation.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
4. Install:
• Brake fluid reservoir bolt
• Owner’s tool kit
5. Install:
• Right rear side cover
Refer to “GENERAL CHASSIS” on page 4-1.
EAS21390
ADJUSTING THE DRIVE CHAIN SLACK
TIP
The drive chain slack must be checked at the
tightest point on the chain.
NOTICE
ECA13550
A drive chain that is too tight will overload
the engine and other vital parts, and one that
is too loose can skip and damage the swing-
arm or cause an accident. Therefore, keep
the drive chain slack within the specified lim-
its.
1. Stand the vehicle on a level surface.
WARNING
EWA13120
Securely support the vehicle so that there is
no danger of it falling over.
TIP
Place the vehicle on a suitable stand so that the
rear wheel is elevated.
2. Move the rear wheel several times and find
the tightest position of the drive chain.
3. Check:
• Drive chain slack “a”
Out of specification
→
Adjust.
4. Adjust:
• Drive chain slack
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a. Loosen the rear wheel axle nut “1”.
b. Loosen both locknuts “2”.
c. Turn both adjusting nuts “3” in direction “a” or
“b” until the specified drive chain slack is ob-
tained.
TIP
• To maintain the proper wheel alignment, adjust
both sides evenly.
• Push the rear wheel forward to make sure
there is no clearance between the swingarm
end plates and the ends of the swingarm.
T
R
.
.
Front brake caliper bleed screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
Rear brake caliper bleed screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
Drive chain slack
40.0–50.0 mm (1.57–1.97 in)
Direction “a”
Drive chain is tightened.
Direction “b”
Drive chain is loosened.