Yamaha 2011 WR250FA Owner's Service Manual page 236

9. Adjust:
• Drive chain slack "a"
Drive chain slack:
48–58 mm (1.9–2.3 in)
Refer to "ADJUSTING THE DRIVE CHAIN
SLACK" section in the CHAPTER 3.
10.Tighten:
• Nut (wheel axle) "1"
Nut (wheel axle):
125 Nm (12.5 m•kg, 90 ft•lb)
• Locknut "2"
Locknut:
19 Nm (1.9 m•kg, 13 ft•lb)
FRONT WHEEL AND REAR WHEEL
6-9