98056-55777 Spark Plug (CR5HSB) - Overview. The 98056-55777 Spark Plug (CR5HSB) is a precision-engineered ignition component designed specifically for Honda marine engine systems. This spark plug plays a crucial role in igniting the fuel-air mixture within the engine combustion chamber, enabling efficient and reliable engine operation. Built to Honda's exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features.