Kawasaki Gas Fuel Cap Zx9 Zx10r Zx10 Zx6 Zx6r 636 650r Made of ultra-light CNC machined billet aluminum! Standard Kawasaki Gas Caps weigh 13.2 oz, while Slingshot Racing Gas Caps weigh only 6.7 oz. This gas cap is ready for mounting as soon as you receive it (that means no additional parts). All you need are basic garage tools and three mounting screws from the original gas cap. Because of the increased percentage of Ethanol in todays fuel, we recommend greasing the gas cap gasket with Silicon Based Grease before installation