31215-ZZ3-003 Planet Gear - Overview. The 31215-ZZ3-003 Planet Gear is a crucial component within Honda marine engine systems. This gear plays a pivotal role in the marine power transmission system by adjusting and delivering rotational force from the engine to the propeller, ensuring efficient propulsion. Designed for seamless integration with existing parts, it maintains optimal performance and durability critical for reliable marine operation.. Key Features. Genuine Honda OEM Planet Gear desi