I have a Gravely 18 HP Kawasaki water cooled 60" cut, an early model, but in the grass cutting field it kicks my Cub Cadets azz! It won't do all my Cadet will but it does what it's designed to do superbly. A good friend has a new Scag 20 HP Kohler air cooled 60" (or close) cut and it will run...