90517-ZW9-000 Nylon (8mm) Washer - Overview. The 90517-ZW9-000 Nylon (8mm) Washer is a crucial component within Honda marine engine systems. Designed to provide reliable fastening support, this washer distributes load evenly and prevents damage between connected parts, playing an integral role in maintaining the operational integrity of marine engines and accessories. Its precise 8mm dimension fits perfectly within factory hardware assemblies, ensuring seamless integration and optimal durability