Please make sure the size of your parts before you place the order Thread Size: M4x0.70 Overall Length: 7mm Keihin Round Style Main Jet ( #78#80#85#87#88#90#92#94#96#98 ) When tuning your carb and trying to get the air/fuel mixture dialed in, start with a larger jet than you think you need and then work your way down in smallincrements, so that you don't go too lean and risk damaging your engine.