31100-ZV4-810 Flywheel - Overview. The 31100-ZV4-810 Flywheel is an essential rotating component within Honda marine engine systems. This part plays a critical role in storing rotational energy, which helps in smoothing engine operation and facilitating the starting process. Designed specifically for Honda Active Marine outboard engines, the flywheel ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. The flywheel serves as a crucial m