Invest in the Stens 11 pc. Carburetor Adjustment Screwdriver Tool Kit. Precision-engineered carburetors deliver smooth operation for outdoor power equipment. Stens carburetors are adjusted and tuned so that they come preset to factory standards, meaning they are ready to install to get equipment back in working order fast. These carburetors mix the optimal amount of air and fuel to feed to the internal combustion engine. The carburetor delivers a uniformly fine mist of fuel with a consistent intake of air. Installing this carburetor will result in easier starts and smoother operation of outdoor power equipment. Designed to meet the real-world conditions of outdoor lawn and landscaping environments, Stens carburetors work flawlessly across a wide range of temperatures from hot to cold weather, delivering consistent reliability in every season. Stens carburetors are known as industry leaders for exceptional operating performance.