90551-ZW1-003 Washer - Overview. The 90551-ZW1-003 Washer is a precision-engineered component designed explicitly for Honda marine engine systems. This washer serves a crucial role within mechanical assemblies by evenly distributing forces, securing fasteners, and preventing wear between connected parts. Essential for maintaining reliable operation and longevity, the washer ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OE