24123-ZVD-300 Shift Spring - Overview. The 24123-ZVD-300 Shift Spring is an essential internal component within Honda marine engine transmission systems. It plays a critical role in ensuring proper engagement and disengagement of gears by providing the necessary tension and return force during shifting operations. Designed to support the transmission system, this genuine part is built to meet precise Honda factory specifications, specifications, dimensions, and tolerances, ensuring seamless oper