Drive Chain Slack - Yamaha 2011 WR250RA Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT

Drive chain slack

The drive chain slack should be
checked before each ride and adjusted
if necessary.
1
2
To check the drive chain slack
1. Place the motorcycle on the side-
stand.
3
TIP
When checking and adjusting the drive
4
chain slack, there should be no weight
on the motorcycle.
5
2. Shift the transmission into the neu-
tral position.
6
3. Push on the drive chain at the cen-
ter point between the chain ten-
7
sioner and the chain support
mounting bolt with a force of 50 N
(5.0 kgf, 11 lbf).
8
4. Measure drive chain slack be-
tween the swingarm and the top of
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the chain link closest to the swing-
arm as shown.
Drive chain slack:
8.0–13.0 mm (0.31–0.51 in)
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1. Drive chain slack
2. Chain support mounting bolt
3. Chain tensioner
5. If the drive chain slack is incorrect,
adjust it as follows.
To adjust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack.
1. Loosen the axle nut and the lock-
nut on each side of the swingarm.
2. To tighten the drive chain, turn the
drive chain slack adjusting bolt on
each side of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting bolt on each side
of the swingarm in direction (b),
7-26
and then push the rear wheel for-
ward. NOTICE: Improper drive
chain slack will overload the en-
1
gine 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 with-
2
in the specified limits.
TIP
Using the alignment marks on each
side of the swingarm, make sure that
both drive chain pullers are in the same
position for proper wheel alignment.
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[ECA10571]