Polaris 2012 WideTrak LX INTL - Manual (Page 74)

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MAINTENANCE
Intake Filter
The intake foam filter and screen limits snow ingestion into the intake
system. When operating in loose powder snow, check the top of the
foam filter and screen periodically to remove any accumulation of snow.
NOTICE: Operating the snowmobile with the intake filters removed may cause
carburetor icing. The result will be poor fuel economy or carburetor
malfunction. Always reinstall the intake filters before operating the
snowmobile.
These illustrations are general representations.Your model may differ.
Intake
Foam Filter and Screen
Foam Filter
Air Intake Box