31100-ZV4-010 Flywheel - Overview. The 31100-ZV4-010 Flywheel is an essential component in Honda marine engine systems. It stores rotational energy and plays a crucial role in regulating engine speed and smooth operation. Designed specifically for Honda outboard engines in the 9.9 to 15 HP range, this flywheel supports the ignition system and helps maintain consistent engine performance. Crafted to meet factory specifications, it ensures seamless integration with existing parts, maintaining opti