Yamaha WR450F(R) Owner's Service Manual page 524

FRONT WHEEL AND REAR WHEEL
5 - 10
9. Adjust:
Drive chain slack a
G
Drive chain slack:
40 ~ 50 mm (1.6 ~ 2.0 in)
Refer to "DRIVE
ADJUSTMENT" section in the CHAP-
TER 3.
10. Tighten:
Nut (wheel axle) 1
G
125 Nm (12.5 m · kg, 90 ft · lb)
Locknut 2
G
16 Nm (1.6 m · kg, 11 ft · lb)
CHAS
CHAIN SLACK