Champion RS9YC Spark Plug, Stock No. 304

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Champion RS9YC Copper Plus Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion RS9YC 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. Built to ISO and SAE standards for proven performance. Champion Spark Plug # 304 Show more