Notice: A drive chain that is too tight will overload the engine and other vital parts, and one that is too loose can skip and damage the swingarm or cause an accident. Therefore, keep the drive chain slack within the specified limits.
1. Stand the vehicle on a level surface.
Warning: Securely support the vehicle so that there is no danger of it falling over.
Place the vehicle on a suitable stand so that the rear wheel is elevated.
2. Move the rear wheel several times and find the tightest position of drive chain.
3. Check:
- Drive chain slack "a"
Out of specification → Adjust.
![](https://motoinstruction.ru/img/yamaha/20/126334.jpg)
Drive chain slack (when adjusting the drive chain) 25.0-35.0 mm (0.98-1.38 in). Drive chain slack (when replacing the drive chain and sprocket) 20.0-30.0 mm (0.79-1.18 in).
4. Loosen:
- Wheel axle nut "1"
![](https://motoinstruction.ru/img/yamaha/20/126335.jpg)
5. Adjust:
- Drive chain slack
a. Loosen both locknuts "1".
b. Turn both adjusting bolts "2" in direction "a" or "b" until the specified drive chain slack is obtained.
Direction "a":
Drive chain is tightened.
Direction "b":
Drive chain is loosened.
![](https://motoinstruction.ru/img/yamaha/20/126336.jpg)
To maintain the proper wheel alignment, adjust both sides evenly.
c. Tighten the wheel axle nut to specification.
Wheel axle nut 150 Nm (15 m·kgf, 110 ft·lbf).
d. Tighten the locknuts to specification.
Locknut 16 Nm (1.6 m·kgf, 11 ft·lbf).