98073-54744 Spark Plug (BMR-4A) - Overview. The 98073-54744 Spark Plug (BMR-4A) is an essential ignition component designed specifically for Honda marine engine systems. It plays a critical role within the ignition system by igniting the fuel-air mixture required for efficient engine combustion, ensuring reliable engine start-up and smooth operation. Crafted to exacting factory specifications, this genuine Honda spark plug guarantees seamless integration with existing parts, maintaining optimal