41112-ZX2-C21 Vertical Shaft - Overview. The 41112-ZX2-C21 Vertical Shaft is an integral component of Honda marine engine systems. It is designed to transmit rotational power from the engine downward to the propeller, ensuring efficient propulsion and smooth operation. This shaft plays a crucial role in maintaining the reliable mechanical linkage within the marine drive system, ensuring your boat performs optimally on water. Engineered to precise factory specifications, it ensures seamless integ