Drive Chain Slack - Yamaha YBR250 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
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1. Drive chain slack
1. Place the motorcycle on the
sidestand.
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. Move the rear wheel by pushing
the motorcycle to locate the
PERIODIC MAINTENANCE AND MINOR REPAIR
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tightest portion of the drive chain,
and then measure the drive chain
slack as shown.
Drive chain slack:
25.0 - 35.0 mm (0.98 - 1.38 in)
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4. If the drive chain slack is incorrect,
adjust it as follows.
To adjust the drive chain slack
1. Axle nut
2. Drive chain slack adjusting nut
3. Locknut
4. Alignment marks
1. Loosen the brake pedal free play
adjusting nut, axle nut, and locknut
at each end of the swingarm.
2. To tighten the drive chain, turn the
adjusting nut at each end of the
Using the alignment marks on each side
of the swingarm, make sure that both
adjusting nuts are in the same position
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for proper wheel alignment.
Improper drive chain slack will
overload the engine as well as other
vital parts of the motorcycle and can
lead to chain slippage or breakage.
To prevent this from occurring, keep
the drive chain slack within the
specified limits.
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swingarm in direction (a). To loosen
the drive chain, turn the adjusting
nut at each end of the swingarm in
direction (b), and then push the rear
wheel forward.
3. Tighten both locknuts and the axle
nut to the specified torques.
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