My guess that one of the positions forces exhaust gas thru/around the air inlet mainfold which helps evaporate/mix the gas better in cold weather. This would hurt horsepower in warm weather. I would assume the hot position is for warm weather and cold for winter, but it might be just the opposite, hot is to warm the manifold for cold weather and cold is to not heat the inlet air manifold during the summer. If someone doesn't definitely give the answer, I would start the tractor and see which position makes the manifold the warmest.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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