56110-ZW4-H11 Piston Rod - Overview. The 56110-ZW4-H11 Piston Rod is a critical component in Honda marine engine systems, specifically engineered for precise hydraulic power transmission. This part plays a vital role within the hydraulic system of Honda marine engines by transmitting the force generated by the piston to operate essential mechanisms, ensuring smooth and reliable engine performance. Crafted to strict factory specifications, the piston rod guarantees seamless integration with exist