Small Engines (Lawn Mowers, etc.): riding mower quits after 5 minutes, craftsman riding mower, hydrostatic transmission

Question
I have a 1995 Craftsman riding mower, 19.5 HP Kohler engine, hydrostatic transmission, 46" deck. I recently changed plugs, air, oil and fuel filters. The mower will start but after 5 minutes, it abruptly quits. It will crank immediately but will not start until it sets for at least 12 or more hours. This has happened several times.

Thanks

Answer
Hi John,

You will need to determine if the problem is a lack of spark or a lack of fuel flow.  Right after it quits, remove the spark plug, reconnect the wire and lay it against the engine head.  Pull the engine over and watch for spark at the plug's electrode.

If good, then try to start it while squirting fuel or starting fluid into the carb intake.  If it starts and you can keep it running by adding fuel, then the carb most likely has dirt, debris or gummed fuel inside.
You will need to remove the carb, disassemble it, clean all the small internal openings and blow it out with compressed air.   Probe each and every hole with a small wire.   A carb rebuild kit wouldn't hurt either.  

Another possibility if the problem is fuel related: Check the gas cap to make sure it is venting and not causing a vacuum in the tank.  

Let me know how you make out.
Michael