Check out any of the twenty-one Carburetor components enlisted.
On this parts fiche the Screw, With Washer(6a3) is the most specified component.
Parts such as the Carburetor: Valve, Needle, Nozzle, Main, Plate, Gasket (nas) are included in the T8plha/pxha/plra/pxra/elha/exha 2002 Carburetor parts fiche.
