Some items from this specific schematic: Insulator,carb, Jet,main(#60), Carburetor Assy (, Packing Set.
The Carburetor is made up of components including this Carburetor Assy(s which is the most expensive.
The most reasonably priced component used on the Gc135\pxa\14zl81e4 Carburetor is the Screw,pan,5x6.