Yamaha TTR 125 2020 Owner's Manual page 57

Drive chain slack:
35.0–50.0 mm (1.38–1.97 in)
4. If the drive chain slack is incorrect,
adjust it as follows. NOTICE: Im-
proper drive chain slack will
overload the engine as well as
other vital parts of the motorcy-
cle and can lead to chain slip-
page or breakage. To prevent
this from occurring, keep the
drive chain slack within the
specified limits.
[ECA10572]
TIP
When checking the drive chain slack,
the chain tensioner should not be
touching the drive chain.
To adjust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack.
1. Loosen the brake pedal free play
adjusting nut.
2. Loosen the axle nut.
3. To tighten the drive chain, turn the
drive chain slack adjusting plate
on each side of the swingarm in
direction (a). To loosen the drive
Periodic maintenance and adjustment
chain, turn the adjusting plate on
each side of the swingarm in di-
rection (b), and then push the rear
wheel forward.
TIP
Make sure that both adjusting plates
are in the same position for proper
wheel alignment.
1. Axle nut
EAUW0664
2. Drive chain slack adjusting plate
3. Position indicator
4. Tighten the axle nut to the speci-
fied torque.
Tightening torque:
Axle nut:
60 N·m (6.0 kgf·m, 44 lb·ft)
5. Adjust the brake pedal free play.
6. Make sure that the drive chain
7-22
(See page 7-18.)
pullers are in the same position,
the drive chain slack is correct,
and the drive chain
smoothly.
moves
7