2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 50Get this manual
MAINTENANCE Apply approximately 20 (0.7 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 hand PRO HONDA FOAM FIL TEA OIL
Install the core into th element and the band onto the elementInstall the element assembly over he connec ting tube lange and onto the guides of th housing properly Tighten the band screwNOTE:
Failure to properly tighten the band screw ill allow the air cleaner element to fall off and engine damage could resultInstall the air cleaner housing cover and secure it with the retaining clipsRemove the seatrea fender (page 3-3),