My 19.5 hp Briggs in my '98 Craftsman rider would not crank either. My problem turned out to be an over filled crankcase from my last oil change. Drained out a pint and back to normal starting. Decided to purchase oil in quarts now instead of 5 quart containers.
Thanks for the invitation to join this Forum. I enjoy tractors, riding mowers, walk-behind mowers and small engines. I look forward to learning and sharing.