90105-ZY6-000 Bolt-Washer (8X30) - Overview. The 90105-ZY6-000 Bolt-Washer (8X30) is a crucial fastening component used in Honda marine engine systems. Primarily designed to secure various engine parts, this bolt-washer combination supports the integrity and reliability of the marine engine's mechanical assemblies. Engineered to fit precisely according to Honda's factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Feat