99101-124-0850 Main (#85) Jet - Overview. The 99101-124-0850 Main (#85) Jet is a critical component within the carburetor system of Honda marine engine systems. It regulates the flow of fuel to the engine, providing precise fuel delivery for optimal performance and engine reliability. Designed to meet all factory specifications, this genuine Honda main jet integrates seamlessly with existing carburetor parts, ensuring smooth and durable operation in demanding marine environments.. Key Features.