A-B1690883-AI VALVE-CHOKEOne New Aftermarket Replacement Choke Valve Fits Briggs and Stratton (Fits Briggs & Fits Stratton) Small Engines This carburetor choke valve is a direct replacement Fits Briggs and Stratton small engines. The choke valve is a butterfly style valve mounted in the carburetor throat that restricts airflow to enrich the fuel air mixture during cold starts, making the engine easier to start. Once the engine reaches operating temperature, the choke valve