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 - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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