Yamaha KODIAK 400 YFM400AS Owner's Manual page 320

5. Squeeze the excess solvent out of the air fil-
ter element and let it dry.
CAUTION:
_
Do not twist the air filter element when squeez-
ing it.
_
6. Inspect the air filter element and replace it if
damaged.
7. Apply foam air filter oil to the air filter element.
If foam air filter oil is not available, engine oil
may be used.
NOTE:
_
The air filter element should be wet but not drip-
ping.
_
8. Pull the air filter element over its frame.
9. Install the air filter element assembly.
10. Install the air filter case cover.
11. Install the seat.
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