I agree, check the head on a piece of glass, make sure you have a good seal between the carb and block, the timing is either off or the carb is set to lean.
Remove the grill and the points cover, crack the point screw loose and tighten it back enough that you can still move the points but not so loose that they will move by themselves. Then set down next to the right front tire with timing light in hand, hooked up and engine running (1600 to 1800 RPM) use a long thin screwdriver, reach around the front of the tractor in through the left hand side of the grill shell, put the screwdriver into the "slot" in the points and adjust the points while watching the timing marks.
Under normal circumstances, the only things that will cause a Kohler to overheat are:
Clogged cooling fins or broken fins on the flywheel.
Too high compression ratio for the grade of gas being used.
Ignition timing advanced too much.
Lean fuel mixture.
A vacuum leak at the carburetor, which will also cause a lean fuel mixture.
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