These are the most popular high performance singles carburetors in power sports. Round slide configuration offers great flow characteristics. Wide range of tuning components available. Use genuine Mikuni jets and parts for best results. Sold each. Made in Japan. Unlike many motorcycle manufacturers purpose modified versions, these factory VM Round Slides are both 2 and 4 stroke compatible and are regarded by the factory to be the best performing version of this carburetor ever made. Spigot Mount: 24mm, The Mikuni VM24-512 is supplied with the following factory jetting installed: Pilot Jet 40 (VM22/210), Needle 5L14-4, Needle Jet N-8 (864 Series), Main Jet 210 (4/042), Air Jet 0.8, Slide Cutaway 1.5 (VM26/21), Needle valve 2.0 (VM26/26)