Carburetor Jet for 50cc 2-Stroke Genuine RoughhouseFits The Following Models :GENUINEPIAGGIOPGOYAMAHAHONDAKYMCOSYMCHINA Cloned: GY6 50cc 139QMB, 125cc 152QMI, 150cc 157QMJ.Jet for PB type Keihin carbs on all Genuine scooters and many others. (The Buddy 50 takes a #74 stock jet and the Buddy 125 takes a #90 stock.)Jetting is something that takes trial and error. See our blog of jetting instructions for more info.DETAILS: 4.0mm Main Jet for PB, PAB, NCV, CVK 17, 20, 22, 24, 26mm carburetors. Please check the markings on your carburetor & verify what yours is before you order.Main Jet size range from #75 to #130.