Yamaha BRUIN 350 YFM350AS Owner's Manual page 278

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
CAUTION:
_
Be sure no foreign material enters the final
gear case.
_
7. Install the oil filler bolt.
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:
16 Nm (1.6 m·kgf)
8-33