Yamaha WR450F(R) Owner's Service Manual page 100

DRIVE CHAIN SLACK ADJUSTMENT
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DRIVE CHAIN SLACK ADJUSTMENT
1. Elevate the rear wheel by placing the
suitable stand under the engine.
2. Check:
Drive chain slack a
G
Above the seal guard installation bolt.
Out of specification → Adjust.
Drive chain slack:
40 ~ 50 mm (1.6 ~ 2.0 in)
NOTE:
Before checking and/or adjusting, rotate the
rear wheel through several revolutions and
check the slack several times to find the tight-
est point. Check and/or adjust the chain slack
with the rear wheel in this "tight chain" position.
3. Adjust:
Drive chain slack
G
Drive chain slack adjustment steps:
Loosen the axle nut 1 and locknuts 2.
G
Adjust the chain slack by turning the
G
adjusters 3.
To tighten → Turn the adjuster 3 coun-
terclockwise.
To loosen → Turn the adjuster 3 clock-
wise and push wheel for-
ward.
Turn each adjuster exactly the same
G
amount to maintain correct axle alignment.
(There are marks a on each side of the
chain puller alignment.)
NOTE:
Turn the adjuster so that the chain is in line
with the sprocket, as viewed from the rear.
CAUTION:
Too small chain slack will overload the
engine and other vital parts; keep the
slack within the specified limits.
INSP
ADJ