50381-ZVL-000 Tilting Shaft - Overview. The 50381-ZVL-000 Tilting Shaft is an essential component within Honda marine engine systems, specifically supporting the tilt mechanism that allows the engine to move up and down. This functionality is integral for maneuvering the boat effectively and safely, as well as facilitating transport and storage by enabling the engine to tilt out of the water.. Key Features. The Tilting Shaft facilitates the mechanical motion required to tilt the outboard engine.