2007-2009 Honda TRX300EX TRX300X service manual, Page 47Get this manual
MAINTENANCE Loosen the band screw and remove the air cleaner , - -element assembly
ELEMENT ASSEMBLY Remove the element band and the element core from the air cleaner elementELEMENT
CORE Wash the element in non -flammable or high flash point solventSqueeze out the solvent thoroughly, and allow the element to dry,Wash Squeeze out Apply approximately 18.4 (0 .65 oz) of Pro Honda Form Filter Oil or equivalent oil from the inside of the elementPlace the element into plastic bag and spread the oil evenly by handPRO HONDA FOAM FILTER OIL