16404-ZY3-000 Spacer - Overview. The 16404-ZY3-000 Spacer is a crucial component within Honda marine engine systems, part of the throttle body assembly. Its primary role is to ensure precise separation between throttle body elements, thereby supporting optimal airflow and engine function. Manufactured to meet Honda's strict OEM standards, this spacer guarantees seamless fitment and integration with existing engine components, maintaining the system's design integrity and performance reliability.. Key Features. Genuine OEM Honda Spacer engineered for throttle body use.. Supports proper alignment and spacing of throttle body components.. Manufactured to exact factory specifications, dimensions, and tolerances.. Enhances overall engine system performance by maintaining optimal airflow.. Designed to integrate cleanly with existing hardware and seals.. Ensures long-lasting durability and consistent operation under marine conditions.. Why Choose Genuine OEM. Using original Honda parts like t