While you are this far into it, if you have time, you may as well pull the engine, do a general cleanup, inspect the ISO mounts and repair/replace as needed, check and tighten engine to cradle bolts, remove the flywheel tin and clean, etc, etc, etc....You will more than likely find the shroud and flywheel full of grass, mouse nests and who knows whatall adding to the overheat problem. You can also resurface the head yourself using a flat piece of thick glass and sandpaper. It will probably cost $20 and up to have a machine shop do it.
Do it all right the first time and you will be rewarded w/years of service. The 1200 is a great little tractor and I use the heck out of mine all year. It's my favorite plow rig.
BTW Kohler recommends doing the head carbon removal thing every 500 hours.
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