Reading about your problem several things come to mind;
-If as you say the tractor has been converted to 12 volt and it has a ballast resistor it is possible you are getting spark while cranking but due to either a wiring issue or a failed ballast resistor you will have no spark once you release the start button.
-Has anything else been checked? compression, valve adjustment etc.
-You say you have a good spark, was that checked on one cylinder or all cylinders?
-Could firing order be mixed up?
-Moisture under distributor cap?
-One or more old wires shorting out?
-Badly restricted air filter?
-Regarding your carburetor, if you are adamant the carb is causing the problem then remove the air intake hose from the carb and squirt a teaspoon of gas directly into it and try starting, if it catches and runs good for a few seconds then you have confirmed you have a fuel problem. If you are getting a good constant flow when the drain plug is removed then it is time for a proper carb dismantle and cleaning.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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