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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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