99101-ZV5-1280 Main (#128) Jet - Overview. The 99101-ZV5-1280 Main (#128) Jet is a critical component within the carburetor of Honda marine engine systems. This jet precisely regulates the fuel flow at higher engine speeds, ensuring optimal combustion and power delivery. As a genuine Honda part, it maintains the highest standards of quality and compatibility, ensuring seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precisely sized #128 mai