90514-921-000 Washer (8mm) - Overview. The 90514-921-000 Washer (8mm) is a vital component in Honda marine engine systems. This washer functions as a flat, plain, metric washer manufactured to OEM standards, ensuring secure fastening and force distribution to maintain assembly integrity in marine equipment. Its precise dimensions and durable construction allow it to seamlessly integrate with existing hardware, supporting reliable performance under marine conditions.. Key Features. Flat 8mm washe