17938-ZV5-000 Spring - Overview. The 17938-ZV5-000 Spring is a genuine Honda OEM component specifically designed for the Opener Cam Return system within Honda marine engines. This spring serves a critical mechanical function by providing the necessary tension for the cam opener mechanism, ensuring smooth and reliable operation of your marine engine's throttle system. By maintaining precise engagement and return action, it helps keep your equipment operating reliably and efficiently.. Key Feature