2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 34Get this manual
MAINTENANCE
MAIN AIR FILTER CLEANING
It is advisable to replace the filter when it is dirtyHowever, in an emergency it is permissible to clean the main filter if you observe the following practicesG Never immerse the filter in water since dirt can be transferred to the clean air side of the filterIf compressed air is used never exceed pressure of 40 PSIAlways use dispersion type nozzle to prevent filter damage and clean from the inside to the outsideReplace the air filter every 50 hours, and possibly more often in very dirty conditions
4Loosen clamp assembly