Drive Chain Slack - Yamaha WR450F Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT

Drive chain slack

The drive chain slack should be
checked before each ride and adjusted
1
if necessary.
2
To check the drive chain slack
1. Place the motorcycle on the side-
3
stand.
TIP
4
When checking and adjusting the drive
chain slack, there should be no weight
5
on the motorcycle.
2. Shift the transmission into the neu-
6
tral position.
3. Pull the drive chain up above the
7
drive chain guard installation bolt
with a force of 50 N (5.0 kgf, 11
lbf).
8
4. Measure drive chain slack be-
tween the drive chain guard and
9
the bottom of the chain as shown.
Drive chain slack:
48.0–58.0 mm (1.89–2.28 in)
EAU22760
1
EAU52480
1. Drive chain guard
2. Drive chain slack
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),
and then push the rear wheel for-
ward. NOTICE: Improper drive
6-25
2
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.
EAU34317
5
4
1. Alignment marks
2. Locknut
3. Drive chain slack adjusting bolt
4. Axle nut
5. Drive chain puller
3. Tighten the axle nut, then the lock-
chain slack will overload the en-
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-
in the specified limits.
[ECA10571]
1
(a)
(b)
1
2
3