Fuel burning efficiency wasn't a perfect science when your tractor was built.
Don't ask me for the math - but if you're burning X amount of gas to produce Y power - then if it's not 100% efficient (and it isn't), there's Z left over coming out the exhaust.
Smell is a very hard way to quantify how much gas isn't burning properly. You certainly wouldn't want to adjust your carb by it.
A better method is to first watch for black smoke. That's a sure indicator that you're running rich. (backfiring is a hint too).
Then also keep a close eye on your plugs - look for carbon buildup over time.
I'm also assuming the engine is running fine and you're not skipping on any cylinders.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil�s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
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