The 18-6964 Sierra starter for Yamaha Outboards features sealed joints and upgraded planetary seals to keep water and moisture out, protecting internal components. Rust-resistant painted finish and a robust clutch gear spring deliver dependable starting power in demanding saltwater environments. Directly replaces Yamaha Outboard 6BG-81800-00-00 & 6BG-81800-01-00. Built to meet or exceed OEM standards.