Parts such as the Carburetor (model K6): Jet,main(162), Jet,slow(42), Needle,jet(nedf), Jet,slow(40) are included in the Rm250z 2002 (k2) Usa (e03) Carburetor (model K6) parts fiche.
Of all the components used in this assembly the Carburetor Assy is the most expensive.