90751-ZW1-003 Dowel Pin - Overview. The 90751-ZW1-003 Dowel Pin is a crucial OEM component designed for Honda marine engine systems, particularly supporting the extension case and gear case assemblies. Its primary role is to provide precise locating and fastening within these systems to ensure reliable engine operation. With a focus on precision and durability, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precision dowel pin