The engine was too old to get any response as to warranty.
Checking the web found that, though not common. Kohler had some problems with cam gears and that seems what happened to mine. But when the cam gear goes and it takes out the pressed on crank gear. Half of the teeth on the cam gear were gone and several on the crank. with both of those gone the governor gear suffered fatal damage. Trouble shooting showed that the valves were not moving at all. I got the, "Gee these engines never do that!" Now that makes me feel special!
Back running as of yesterday. Re-installation pretty simple. Took the opportunity while the engine was out to pressure wash the mill. Now I've got a clean old mill.
Repair bill was about $850 and most of that was for parts. $325 for just the crank.
Side note: Offered to pay with either credit card or cash but if cash I'd want a 2% discount. He took the cash!
At least the bank doesn't get a cut on my misfortune. Makes me feel a little better!