The Screw-washer,4x16 is the most widely applied product in the XR500 1979 (Z) CANADA E-16 CARBURETOR ( three times ).
The thirty Xr500 1979 (z) Canada E-16 Carburetor component parts are all listed in this schematic.
The Xr500 1979 (z) Canada E-16 Carburetor consists of thirty pieces with the Carburetor Assy. being the most expensive.