56120-ZW1-305 Piston Rod - Overview. The 56120-ZW1-305 Piston Rod is a critical component within the Honda marine engine systems. It serves as the connecting link between the piston and crankshaft, transmitting combustion force to generate power. This part is essential for the mechanical motion that drives the engine reliably and efficiently. Precisely engineered for high durability, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Feature