Parts such as the Carburetor (model K4): Screw Set,air, Needle,jet(necf), Jet,main(168), Valve,throttle are included in the Rm250 2004 (k4) Usa (e03) Carburetor (model K4) parts fiche.
This CARBURETOR (MODEL K4) assembly utilises four Screw(s) - the highest specified component.