The Z550 zero-turn riding mower provides the ultimate mowing experience. Its strong 23 HP* Briggs & Stratton® ReadyStart® twin-cylinder engine has an easy and reliable starting system with no prime, no choke and features a 50-in. steel deck. Equipped with a sleek new frame design, a dual range hydrostatic transmission and high-back seating for optimum support and comfort, it will provide an exceptional ride as you power through the lawn with its zero-turn radius. You can add an optional mulching kit to create the perfect finishing touches.