Sierra HC4645-3 BayStar Outboard Cylinder The Sierra SeaStar HC4645-3 BayStar outboard cylinder is an easy and affordable way to upgrade your steering system from mechanical to hydraulic. Its compact form is made for smaller outboards up to 150HP and is able to fit most splashwells. Features Compact design Rigid ISO quality control Easy to install Fits most splashwells Precision manufacturing balanced cylinder Specifications Actuation Stroke Length 8 Horse Power Rating 150HP Maximum pressure rat