Yamaha YZ450FX 2021 Owner's Service Manual page 180

4. Install:
• Rear wheel
Refer to "REAR WHEEL" on page 4-9.
5. Adjust:
• Drive chain slack
Refer to "DRIVE CHAIN SLACK" on page
3-26.
Drive chain slack (Maintenance
stand)
50.0–60.0 mm (1.97–2.36 in)
4-66
SWINGARM