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Are there oil seals on the valves? or intake valve guide so badly worn it's letting letting a lot of oil be drawn in? Compression sounds decent , but what shape is the oil control ring in ? The only other thing beyond those items is easy to check... Is the crank case over filled with oil and oil being drawn through the carb from the crank case vent? Those are the only ways I can think of that it can get oil fouled. . If it is just carbon fouled it has to be running super rich, and I can't see it running well at all if it can foul the plug that fast. Is the plug the recommended one ? Have you tried one with a higher heat range?