13101-ZW9-000 Piston - Overview. The 13101-ZW9-000 Piston is a critical internal component within the Honda marine engine systems. It functions within the combustion chamber of the engine, facilitating the conversion of fuel combustion into mechanical motion, which powers the boat. Engineered for the piston system, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precision-crafted piston designed for Honda marine outboard motors.