90163-ZW4-010 Flange (10X80) Bolt - Overview. The 90163-ZW4-010 flange (10X80) bolt is a critical fastening component specifically designed for Honda marine engine systems. This OEM-grade bolt plays a vital role in securely fastening essential parts within Honda's marine engines, ensuring system integrity and operational reliability. Crafted to match factory specifications with exact dimensions and tolerances (10mm diameter, 80mm length), it ensures seamless integration with existing parts, main