2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 70Get this manual
Pull choke cable to remove choke plunger from carburetor Connect clean plastic tubing to the inlet nipple and alternately apply pressure and vacuum with pumpThe inlet valve should release with pressure and hold under vacuumRepeat the same procedure at the outlet nippleThis time the outlet valve should hold with pressure and release under vacuumCheck impulse diaphragm and gasket on high-supply fuel pump with twin outlets as follows: Connect clean plastic tubing to the impulse nipple and plug vent hole on top coverEither apply pressure or vacuumThe diaphragmgasket must not leak
Remove: Allen screw on the side of knob rubber bellows
Unscrew the plastic jam nutUnscrew slit nut under steering coverPull cable away from frame