99101-GHB-1000 Main (#100) Jet - Overview. The 99101-GHB-1000 Main (#100) Jet is a critical fuel system component that supports the carburetor system in Honda marine engines. Serving as a precise regulator of fuel flow, this main jet ensures your engine receives the optimal mixture required for efficient and reliable operation. Designed to the exact factory specifications, it maintains Honda's performance standards and integrates seamlessly with existing carburetor hardware.. Key Features. Preci