The most expensive part in this assembly is the Carburetor Assy.
Parts such as the Carburetor (assy.): Clip B10,tube, Screw,pan, Clip,plate, Screw Pan 5x40 are included in the Xl600v Transalp 1990 (l) France / Yb Carburetor (assy.) parts fiche.
The component with the lowest price in the CARBURETOR (ASSY.) schematic is the Screw Pan 5x40.