Try the following..
1: CLEAN the engine and make sure that there are no obstructions in the cooling path. You can use high pressure air and blow out all the dirt, mud dauber's nests, etc, that may have been blocking the flow of cool air from the flywheel, across the head and engine cooling fins.
2; Make sure the engine is in good tune, points adjusted to spec, carb set, etc. Avoid running lean, it will cause overheating.
3: Try running a little Marvel Mystery oil in your gas. I know, snake oil.... but it actually helps out in the Kohlers.
If all else fails, you may need to decarbonize the piston , head, and valves, and in extreme cases dismantle the valvetrain and run the correct reamer thru a tight guide. Clearance is recommended to be at 4 thousandths.
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Quietlines and narrow frames, mostly projects but I mow with a 1200 and have a 122 set up for pulls. Wandering the country bringing towers to wind farms everywhere, and bringing yellow stuff home to Texas. Also into flatfender jeeps.
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