Yamaha BIG BEAR 250 YFM25BZ Owner's Manual page 97

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1. Final gear oil filler bolt
2. Gasket
3. Final gear oil
4. Correct oil level
3. If the oil is below the brim of the filler hole, add
sufficient oil of the recommended type to raise
it to the correct level.
4. Check the gasket for damage, and replace it if
necessary.
5. Install the oil filler bolt and its gasket, and then
tighten the bolt to the specified torque.
Tightening torque:
Final gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
To change the final gear oil
1. Place the ATV on a level surface.
2. Remove the final gear case guard by remov-
ing the bolts.
1. Final gear case guard
2. Bolt
3. Place an oil pan under the final gear case to
collect the used oil.
4. Remove the final gear oil filler bolt, the final
gear oil drain bolt, and their gasket to drain the
oil from the final gear case.
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