90104-ZVA-000 Bolt-Washer (6X30) - Overview. The 90104-ZVA-000 Bolt-Washer (6X30) is a crucial component designed for Honda marine engine systems. This bolt with an integrated washer, measuring 6mm by 30mm, plays a vital role in securing various parts of the marine engine, ensuring durability and system integrity. Manufactured to meet exact OEM specifications, this bolt-washer integrates seamlessly into Honda marine applications, maintaining optimal performance and reliability.. Key Features. Sp