40210-ZW9-A30 Vertical Shaft Bush - Overview. The 40210-ZW9-A30 Vertical Shaft Bush is an essential component within Honda marine engine systems. It functions as a durable bushing designed to support the vertical shaft, reducing wear and tear while ensuring smooth rotational motion. Critical for maintaining reliability and operational efficiency in Honda active marine equipment, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Hi