My 1863, purchased new back in about 1992, has always run way too hot to touch the muffler. But, I am not concerned. Seems normal for an air cooled engine. No temperature measurements. I use only synthetic oil and an oversize oil filter on the 18hp Kohler. Years ago I added an oil cooler to the blower housing. The oil hoses connect to an under oil filter adaptor. The cooler fins are blown out a few times a year with compressed air as it accumulates dirt/debris. I don't know if the oil cooler helps, but warm air exits the cooler.
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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