Drive Chain Slack - Yamaha R25 Series Owner's Manual

Drive chain slack

The drive chain slack should be
checked before each ride and adjusted
if necessary.
To check the drive chain slack
1. Place the motorcycle on the side-
stand.
TIP
When checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.
2. Shift the transmission into the
neutral position.
3. Measure the drive chain slack as
shown.
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1. Drive chain slack
Periodic maintenance and adjustment
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Drive chain slack:
35.0–45.0 mm (1.38–1.77 in)
4. If the drive chain slack is incorrect,
adjust it as follows. NOTICE: Im-
proper drive chain slack will
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overload the engine as well as
other vital parts of the motorcy-
cle and can lead to chain slip-
page or breakage. If the drive
chain slack is more than , the
chain can damage the frame,
swingarm, and other parts. To
prevent this from occurring,
keep the drive chain slack with-
in the specified limits.
To adjust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack.
1. Remove the drive chain puller cap,
and then loosen the axle nut and
the locknut on each side of the
swingarm.
7-25
1. Axle nut
2. Locknut
3. Drive chain puller cap
2. To tighten the drive chain, turn the
drive chain slack adjusting nut on
each side of the swingarm in di-
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rection (a). To loosen the drive
chain, turn the adjusting nut on
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each side of the swingarm in di-
rection (b), and then push the rear
wheel forward.
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