90512-ZW2-000 Special Washer - Overview. The 90512-ZW2-000 Special Washer is an essential component designed specifically for Honda marine engine systems. This special washer plays a critical role in securing and maintaining structural integrity within specific assemblies, helping to ensure the reliable function of marine engines and equipment. Manufactured to meet Honda's precise factory specifications, this washer supports the overall system by providing secure fitting, sealing, or mounting as