99101-GHB-1080 Main (#108) Jet - Overview. The 99101-GHB-1080 Main (#108) Jet is an essential component of Honda marine engine carburetor systems. It regulates the fuel flow into the engine at wider throttle openings, ensuring smooth, reliable engine operation and optimal fuel mixture. This part is critical for maintaining efficient combustion, engine responsiveness, and overall marine engine performance. Designed to OEM standards, it fits seamlessly with Honda marine carburetors, preserving fac