2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 94Get this manual
CLEANING THE AIR FILTER ELEMENT EBS00073
CLEANING THE AIR FILTER ELEMENT
NOTE: There is check hose at the bottom of the air filter caseIf dust andor water collects in this hose, clean the air filter element and air filter case_
1Remove: seat Refer to "SEAT, FENDERS AND FUEL TANK"