31247-Zz3-003 Gear Assembly (Inner) - Overview. The 31247-ZZ3-003 Gear Assembly (Inner) is a crucial internal gear component supporting Honda marine engine systems. This part plays a vital role in facilitating smooth operational movement and power transmission within the marine propulsion system. Designed specifically for Honda's high standards, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Specialized Gear Assembly that opera