99101-ZV5-1200 Main (#120) Jet - Overview. The 99101-ZV5-1200 Main (#120) Jet is a critical component within the fuel system of Honda marine engines. This jet plays an essential role in regulating the flow of fuel in the carburetor, particularly at higher throttle positions, which directly impacts the engine's overall efficiency and responsiveness. Designed as a genuine Honda part, it ensures seamless integration with existing carburetor components, maintaining optimal performance and durability