I'd go back to the basics....an engine needs three things to run 1) Spark, 2) compression, and 3) fuel. I'd pull the plugs and run a compression check on all cylinders making sure that they are all within 10% of each other. It's a safe bet that you have good compression since the tractor runs on diesel (but it's still worth a check as there could be a problem with the gas side of the valving). Next, I'd check each spark plug by grounding on the side of the engine and making sure that all fire hot while turning the engine. If you get good compression and good spark, then you can turn your attention to the fuel side.
Remember, part of the switch-over mechanism are two butterfly valves that close the air off from the carburetor. I know that when I pulled my intake manifold off my MD, I had to make sure that the switch made this valve function properly when I re-installed.
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