2004-2005 Honda TRX450R Factory Sevice Manual, Page 93Get this manual
FUEL SYSTEM Rem ov the pump cover, spri ng and di aphragmVisually inspect the follow ng:iap hrag for deterioratio or pin hol esspring fo damagediaphrag shaft fo excessive we ar or am agerifice in th cover fo clog gi ng restr icti on
DIAPHRAGM
FLOAT AND JETS
NOTE: The carb uretor heate and spacer can removed after rem ovin the flo at chamber