Sounds like it could be a lean running situation. Is the exhaust manifold getting super duper hot?
Do you have good fuel flow? It is possible that the oil pressure shutoff under the tank is not releasing enough fuel flow. Do you have good oil pressure? Any inline filters in the system? Loosen the drain on the bottom of the fuel bowl and hold down the knurled nut on the oil pressure controlled fuel shutoff. Does it run a full stream for 45 seconds? If not look for your obstruction.
How is the condition of the ignition? Point contacts clean and free of corrosion? Tractor producing a blue spark through both plugs while cranking? If not look for the reason for weak spark.
If you do suspect a sticky valve run a compression test on both cylinders to see if they are similar in value.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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