50515-ZW9-300 Tilt Lever Spring - Overview. The 50515-ZW9-300 Tilt Lever Spring is a critical component in the Honda marine engine systems, primarily supporting the tilt mechanism. It is engineered to provide the necessary tension and reliable spring-back action to the tilt lever, ensuring smooth and controlled adjustment of the outboard motor's tilt angle. Designed specifically for Honda marine tilt systems, it helps maintain the integrity and functionality of the power trim and tilt operations