How do you adjust valves on 19 hp kohler courage engine?

To adjust the valves on a 19 HP Kohler Courage engine, first ensure the engine is cool and disconnect the spark plug wire for safety. Remove the valve cover, then use a feeler gauge to check the clearance between the rocker arm and the valve stem, which should be set to the manufacturer's specifications (typically around 0.005 inches for the intake and 0.007 inches for the exhaust). If adjustment is needed, loosen the lock nut on the rocker arm, turn the adjusting screw to achieve the correct clearance, and then retighten the lock nut. Finally, replace the valve cover and reconnect the spark plug wire.