Some items from this specific schematic: Cover-carburetor, Tube,4.5x8x330, Jet-main,#158, Seat-spring,valve.
Of all the components that make up this Carburetor the Screw-pan-cros,4x8 has the lowest price.
The Carburetor assembly is constructed from several parts from which the Carburetor-assy is the most expensive.