Polaris Outlaw 9921811 Owner's Manual page 140

Maintenance
Air Filter
5. Clean away any oil or sediments in the air box.
6. Reinstall the filter and air box cover. Secure the clips.
7. Reinstall the seat.
NOTICE: Never operate the ATV with the filter element removed. Dirt will enter the engine causing
rapid wear and severe damage to the engine.
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