Some items from this specific schematic: Ring-o,starter Plunge, Main Jet,2nd #128, O Ring,drain Screw, Tube,3.5x6.5x300.
Of all the components that make up this Carburetor(2/3)(ksf250-a15/a16) the Washer,plain has the lowest price.
Of all the components used in this assembly the Tube,6.5x11.5x360 is the most expensive.