This Jet kit includes 1 new "Trick" GX140 emulsion tube and 2 new jets (.036 inch & .037 inch ).The tube/jets fit the GX140, GX160 (5.5hp), GX200 (6.5hp) and all similar style Clone engines (5.5hp and 6.5hp). Similar Clone engines include Ducar, 212cc, , and Launtop.If your engine runs poorly, or on half choke after upgrading your Air Filter and Exhaust, this Kit will most likely solve your problem.This E-tube has a slightly larger main bore and less air bleed holes providing a better fuel signal. This E-tube improves performance through the rpm range. Throttle response is improved better from bottom end and mid-range.Try the smaller jet first Name: Carburetor Jet KitSize: Emulsion Tube: 2.8 x 0.6cm/ 1.1 x 0.24in; 0.8 x 0.7cm/ 0.31 x 0.28 inMaterial: coppercolour: goldPackage Contents:1 x Carburetor KitOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.