90502-ZVT-000 Washer (6Mm) - Overview. The 90502-ZVT-000 Washer (6Mm) is a crucial component in Honda marine engine systems. This washer supports the rigging and fastening systems of Honda outboard engines, ensuring a reliable and secure connection between assembled parts. Engineered to meet OEM standards, it plays a key role in maintaining the mechanical integrity and safety of marine equipment. By evenly distributing pressure, it prevents wear and potential damage due to uneven stress.. Key Fe