Please make sure the size of your parts before you place the orderThread Size: M4x0.70Overall Length: 7mmRound Style Main Jet, used for GY6 49cc 50cc 80cc 100cc engineWhen tuning your carb and trying to get the air/fuel mixture dialed in, start with a larger than you think you need and then work your way down in small increments, so that you don’t go too lean and risk damaging your engine.1.New Produwith High Quality2.Replacement for GY6 50cc Carburetor Main Jet3.Fits Most of Made Scooters and ATV. Such as JONWAY, JMSTAR, TANK, PEACE, Dongfang, Kazuma, JCL, BMS