Champion RL82YC Marine Spark Plug z Champion marine spark plugs are quality OEM replacements. The Champion RL82YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads. Resists fouling; Superior corrosion resistance; Dependable and proven performance; Increased conductivity and heat control for good overall wear; Champion Spark Plug # 814