Yamaha - Engine Anode Corrosion Protection 63P-11325-21-00. Overview. Corrosion is something every boater deals with, especially when Yamaha outboards spend time in saltwater or brackish conditions. The Yamaha Engine Anode 63P-11325-21-00 is designed to take on that corrosion before it reaches critical engine components. It sacrifices itself to electrolysis, protecting the surrounding metal surfaces inside the engine. It's one of those small maintenance parts that quietly protects your motor eve