The most reasonably priced component used on the Xj900s 2002 4kmd Spain 1a4km-300e1 Carburetor is the Screw, Pan Head.
The sub assemblies and components that make up this Carburetor include this Carburetor Assy, the most expensive part.
Some items from this specific schematic: Pilot Screw Set, Float, Throttle Sensor Assy, Spring.