16130-ZW2-F01 Auto Bystarter - Overview. The 16130-ZW2-F01 Auto Bystarter is an essential automatic choke mechanism designed for Honda marine engine systems, specifically tailored to support the carburetor in Outboard Motor 4T engines such as the BF25D and BF30D series. Its primary role is to enrich the fuel-air mixture during cold starts, ensuring the engine starts smoothly and maintains consistent operation. Developed to match Honda's strict factory specifications, the auto bystarter guarantee