Yamaha YFZ450R 2017 Owner's Manual page 120

1. Drive chain slack
3. If the drive chain slack is incorrect, adjust it as
follows.
8
To adjust the drive chain slack
1. Place the ATV on a level surface.
2. Loosen the rear wheel axle pinch bolts.
3. Insert a rod of a diameter of 8 mm (0.3 in) and
a length of 10 cm (4 in) into one of the holes in
the drive chain tensioner as shown.
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8-36
3
4
2
1. Rear wheel axle pinch bolt
2. Rod
3. Drive chain tensioner
4. Hole
TIP
A rod can be obtained at a Yamaha dealer to make
this adjustment.
4. Shift the transmission into neutral.
5. To tighten the drive chain, push the ATV
backward. To loosen the drive chain, push
the ATV forward. NOTICE: Improper drive
chain slack will overload the engine as well
as other vital parts of the ATV and can lead
to drive chain slippage or breakage. To
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1