Yamaha YZ250 2005 Manuel D'atelier Du Proprietaire page 386

FRONT WHEEL AND REAR WHEEL
8. Install:
9 Chain puller (right) 1
9 Plain washer 2
9 Nut (wheel axle) 3
NOTE:
Temporarily tighten the nut (wheel axle) at this
point.
9. Adjust:
9 Drive chain slack a
Drive chain slack :
48~58 mm (1.9~2.3 in)
Refer to "DRIVE CHAIN SLACK ADJUSTMENT"
section in the CHAPTER 3.
10. Tighten:
9 Nut (wheel axle) 1
9 Locknut 2
5-9
CHAS
125 Nm (12.5 m•kg, 90 ft•lb)
16 Nm (1.6 m•kg, 11 ft•lb)