ZSDTRP Motorcycle PHBG Manual Pull Choke Automatic Choke Assembly For PHBG 16AS 21AS 21DS 21BS Carburetor PHBL PHBH This choke assembly is designed for use with PHBG series carburetors including models 16AS, 21AS, 21DS, and 21BS, as well as PHBL and PHBH variants.It features a manual pull choke mechanism that allows for precise control during cold starts.The unit integrates an automatic choke function to regulate engine idle and improve fuel efficiency once the engine reaches operating temperature.Constructed to match specifications, it supports in motorcycle applications equipped with compatible carburetor systems.Installation requires proper alignment with the carburetor throat and linkage setup to ensure smooth and consistent performance. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.