16166-ZW9-003 Main Nozzle - Overview. The 16166-ZW9-003 Main Nozzle is an essential fuel system component for Honda marine engine systems. This OEM main nozzle precisely meters fuel into the combustion chamber, supporting efficient fuel delivery and combustion for optimal engine performance and reliability. Built to match exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Delivers precise metering of f