Other than the comp ratio of heads could be different, the ignition systems have several different spark advances. Magneto was basically 35 degrees , batt ign could be 40 ,30, 25, 22, or 16 so that would be one place I would check out. Some minor changes were made in carburetors, main jet size, air bleed size or blocked air bleed on some power packs. Valve length will tell you which head you have but of course you can't tell that without disassambly. You could check the head numbers under valve cover. A worn out govenor will make a gutless wonder also along with the proper adjustment of govenor internal linkage.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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