Yamaha 2004 WR250FS Owner's Service Manual page 238

FRONT WHEEL AND REAR WHEEL
5 - 10
8. Install:
• Right drive chain puller 1
• Washer 2
• Nut (wheel axle) 3
NOTE:
Temporarily tighten the nut (wheel axle) at this
point.
9. Adjust:
• Drive chain slack a
Drive chain slack:
40 ~ 50 mm (1.6 ~ 2.0 in)
Refer to "DRIVE
ADJUSTMENT" section in the CHAPTER
3.
10. Tighten:
• Nut (wheel axle) 1
125 Nm (12.5 m · kg, 90 ft · lb)
• Locknut 2
16 Nm (1.6 m · kg, 11 ft · lb)
CHAS
CHAIN SLACK