These old engines are tired after many years. If there's no external leaks, Pull the spark plug and take a look at it, you'll probably see evidence of oil getting burnt. A combination of the cylinder in them getting out of round and worn rings is most likely the culprit. Unfortunately it's time to rebuild.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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