98073-54754 Spark Plug (W14MR-U) - Overview. The 98073-54754 Spark Plug (W14MR-U) is a vital ignition component designed specifically for Honda marine engine systems. It supports the ignition system by igniting the fuel-air mixture inside the engine cylinders to initiate combustion, which is crucial for generating engine power and ensuring reliable operation. As a genuine OEM part, it guarantees seamless integration with your Honda marine engine, maintaining optimal performance and durability..