Adjusting The Drive Chain Slack - Yamaha R15 2022 Service Manual

d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
f. Fully pull the brake lever or fully press
down the brake pedal and hold it in posi-
tion.
g. Loosen the bleed screw.
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
bubbles have disappeared from the brake
fluid in the plastic hose.
j. Check the operation of the hydraulic unit.
Refer to "HYDRAULIC UNIT OPERA-
TION TESTS" on page 4-53.
ECA18060
Make sure that the main switch is turned to
"OFF" before checking the operation of the
hydraulic unit.
k. After operating the ABS, repeat steps (e)
to (i), and then fill the brake master cylin-
der reservoir or brake fluid reservoir to the
proper level with the specified brake fluid.
l. Tighten the bleed screw to specification.
Front brake caliper bleed screw
14 N·m (1.4 kgf·m, 10.0 lb·ft)
Rear brake caliper bleed screw
5 N·m (0.5 kgf·m, 3.7 lb·ft)
m. Fill the brake master cylinder or brake fluid
reservoir to the proper level with the spec-
ified brake fluid.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-18.
Specified brake fluid
DOT 4
EWA13110
WARNING
After bleeding the hydraulic brake system,
check the brake operation.
CHASSIS
EAS30644

ADJUSTING THE DRIVE CHAIN SLACK

TIP
The drive chain slack must be checked at the
tightest point on the chain.
ECA13550
A drive chain that is too tight will overload
the engine and other vital parts, and can lead
to chain slippage or breakage. If the drive
chain slack is more than the specified limit,
the chain can damage the frame, swingarm,
and other parts or cause an accident. To pre-
vent this from occurring, keep the drive
chain slack within the specified limits.
1. Stand the vehicle on a level surface.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Shift the transmission into the neutral posi-
tion.
TIP
Place the vehicle on a maintenance stand so
that the rear wheel is elevated.
3. Turn the rear wheel several times and find the
tightest position on the drive chain.
4. Check:
• Drive chain slack "a"
Out of specification → Adjust.
Drive chain slack
30.0–40.0 mm (1.18–1.57 in)
TIP
Measure the drive chain slack halfway between
the drive axle and the rear wheel axle.
3-21
CHK
ADJ