Yamaha BR250F Service Manual page 54

11. Secure the drive and driven sprockets
onto their respective shafts. Torque the
securing hardward to specification. Use
a new cotter pin with the drive sprocket.
Tightening torque:
Drive sprocket nut: 4.0 rn-kq
(29 ft-lbl
Driven sprocket bolt: 2.3 rn-kq
(17 ft-lb)
12. Adjust the chain tension. Turn the
adjusting bolt until the chain deflection
equals specification. Torque the lock nut
to specification.
Chain deflection
8 '" 15 mm (0.3 '" 0.6 in)
Tightening torque:
3.5 m-kq (25 ft-lb)
1. Chain deflection
13. Install the chain case cover. Torque the
two bolts to specification. Be sure the
rubber gasket is properly seated on the
chain case.
Tightening torque:
1.6 m-kq (12 ft-lb)
14. Add oil to the chain case until oil begins
to flow from the oil drain bolt.
Recommended oil:
SAE 75W80 API-GL3 Gear Oil
4·13
1. Oil drain bolt
15. I nstall the secondary sheave onto the
jackshaft. (Refer to 4-5, C "Assembly.")
16. Reconnect and adjust the brake cable.
(Refer to 4-7, D "Brake Adjustment.")