99101-GHB-1020 Main (#102) Jet - Overview. The 99101-GHB-1020 Main (#102) Jet is a critical carburetor component supporting the fuel system of Honda marine engine systems. It regulates fuel flow to the engine at higher throttle positions, ensuring optimal combustion and engine performance. As a genuine OEM component, it ensures exact factory dimensions and tolerances, providing reliable and consistent operation. Designed to seamlessly integrate with existing carburetor hardware, this jet maintai