Yamaha BIG BEAR 400 Owner's Manual page 120

6. Add the recommended final gear oil to
the brim of the filler hole.
Recommended oil:
SAE 80 API GL-4 Hypoid gear oil
Oil quantity:
0.23 L (0.20 Imp qt, 0.24 US qt)
CAUTION:
_
Be sure no foreign material enters the final
gear case.
_
7. Install the oil filler bolt, and then tighten it
to the specified torque.
Tightening torque:
Final gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
8. Check for oil leakage. If oil leakage is
found, check for the cause.
9. Install the final gear case cover bolts, and
then tighten them to the specified torque.
Tightening torque:
Final gear case cover bolt:
17 Nm (1.7 m·kgf, 13 ft·lbf)
8-13