90407-920-000 Spring (6Mm) Washer - Overview. The 90407-920-000 Spring (6Mm) Washer is a critical component in Honda marine engine systems. This washer acts as a vibration dampener and fastener support, maintaining tension and preventing parts from loosening under operation stress. It ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. A 6mm spring washer designed to compress under pressure, providing a secure and stable fastening solu