This 15mm Carburetor with Manual Choke is most commonly used for (and not limited to) 2-stroke pocket bikes, mini dirt bikes and mini quads (ATVs). Also used for some 49cc 2-stroke scooters and smaller buggies/go-karts. Applies to a large variety of 2-stroke machines from weed wackers to leaf blowers, 33cc and 43cc displacements are common as well as the standard 47cc and 49cc. Mounting holes are 31mm apart center to center.