Adjusting The Throttle Cable Free Play; Adjusting The Front Brake; Bleeding The Hydraulic Brake System - Yamaha 2002 YZ250FR Assembly Manual

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EAA01022
D. ADJUSTING THE THROTTLE
CABLE FREE PLAY
NOTE:
Prior to adjusting throttle cable free play, the
engine idling speed should be adjusted.
1. Measure:
Dthrottle cable free play (a)
Out of specification>Adjust.
Throttle cable free play (at the flange of
the throttle grip)
3 ~ 5 mm (0.12 ~ 0.20 in)
2. Adjust:
Dthrottle grip free play
a. Slide back the rubber cover.
EAA01024
E. ADJUSTING THE FRONT BRAKE
1. Measure:
Dbrake lever position (a)
(distance (a) from the throttle grip to the
brake lever)
Out of specification>Adjust.
Brake lever position
(distance (a) from the throttle grip to
the brake lever)
Standard position
95 mm (3.74 in)
Extent of adjustment
76 ~ 97 mm (2.99 ~ 3.82 in)
2. Adjust:
Dbrake lever position
(distance (a) from the throttle grip to the
brake lever)
a. Loosen the locknut (1).
b. Turn the adjusting bolt (2) in direction (a)
or (b) until the specified brake lever posi-
tion is obtained.
c. Tighten the locknut.
Locknut:
5 Nm (0.5 mdkg, 3.6 ftdlb)
EAA01034
F. BLEEDING THE HYDRAULIC
BRAKE SYSTEM
W
Bleed the hydraulic brake system when-
ever:
D The system was disassembled,
D A brake hose was loosened or
removed,
D The brake fluid level is very low,
D Brake operation is faulty.
A dangerous loss of braking perfor-
mance may occur if the brake system is
not properly bled.
1. Remove:
Ddiaphragm
Dprotector (rear brake)
- 15 -
b. Loosen the locknut (1).
c. Turn the adjusting nut (2) in direction (a)
or (b) until the specified throttle cable
free play is obtained.
Direction (a)
Throttle cable free play is increased.
Direction (b)
Throttle cable free play is decreased.
d. Tighten the locknut.
W
After adjusting the throttle cable free
play, start the engine and turn the han-
dlebar to the right and to the left to
ensure that this does not cause the
engine idling speed to change.
Direction (a)
Brake lever distance is increased.
Direction (b)
Brake lever distance is decreased.
W
A soft or spongy feeling in the brake
lever can indicate the presence of air in
the brake system. Before the vehicle is
operated, the air must be removed by
bleeding the brake system. Air in the
brake system will considerably reduce
braking performance and could result in
loss of control and possibly an accident.
Therefore, check the brake system and
bleed if necessary.
CAUTION:
After adjusting the brake lever position,
make sure that there is no brake drag.
NOTE:
D Be careful not to spill any brake fluid or
allow the brake master cylinder reservoir
to overflow.
D When bleeding the hydraulic brake sys-
tem, make sure that there is always
enough brake fluid before applying the
brake. Ignoring this precaution could
allow air to enter the hydraulic brake sys-
tem, considerably lengthening the bleed-
ing procedure.
D If bleeding is difficult, it may be neces-
sary to let the brake fluid settle for a few
hours. Repeat the bleeding procedure
when the tiny bubbles in the hose have
disappeared.

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