41121-ZV4-000 Pinion Shaft - Overview. The 41121-ZV4-000 Pinion Shaft is a critical OEM component designed for Honda marine engine systems. This shaft plays a vital role within the power transmission system by transferring rotational force from the engine to the propeller shaft, ultimately enabling the boat to move efficiently and reliably. Precision engineered to meet Honda's factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durabil