1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 96Get this manual
FUELSVSTEM Check the valve fOf Ili,cks, grooves or other damageCheck he va lvs seat for weaL Check he O-ri ng for wear damag, e
SE VALVE
The SE va lve and O-ri ng must he rep laced as aset
VALVE SEAT
FLOAT AN:D JETS
Disconnect the air ven'l tube, air cut off va lve tube (I, overflow tuba from the carburetor bodyn