99101-KPB-1020 Main (#102) Jet - Overview. The 99101-KPB-1020 Main (#102) Jet is a vital part of the fuel system in Honda marine engine systems. It regulates the fuel flow to the carburetor, ensuring the engine operates smoothly and efficiently. Crafted to factory specifications, this main jet integrates seamlessly with existing hardware to maintain peak engine performance and durability.. Key Features. This main jet controls fuel delivery within the carburetor system, specifically calibrated to