Yamaha YXR660FAS Owner's Manual page 101

Final gear oil replacement
1. Place the vehicle on a level surface.
2. Place a container under the final gear
case to collect the used oil.
3. Remove the oil filler bolt and the drain
bolt to drain the oil.
1. Final gear oil drain bolt
4. Install the drain bolt, and then tighten it to
the specified torque.
Tightening torque:
Final gear oil drain bolt:
20 Nm (2.0 m·kgf, 14 ft·lbf)
5. Add the recommended final gear oil up to
the brim of the filler hole.
Recommended oil:
SAE 80 API GL-4 Hypoid gear oil
Oil quantity:
0.25 L (0.22 Imp qt, 0.26US qt)
CAUTION:
_
Be sure no foreign material enters the final
gear case.
_
6. Install the oil filler bolt.
7. Check for oil leakage. If oil leakage is
found, check for the cause.
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