What is the quality of spark when the tractor dies? Your tractor came from the factory with a 6 volt system. It now has a hybrid 12 volt system. Are you using a "true" 12 volt coil or a 6 volt coil with a resistor? If you are using a 6 volt coil, then the resistor must be matched to the primary resistance of the coil. Just any resistor won't do. Does your system use a resistor bypass for starting? These can be misleading as you will have good spark while the resistor is being bypassed during cranking, but weak spark on run.
If this checks out ok, it is probably time to take the manifold off. With the manifold off, I usually fill the exhaust side with water and see if it seeps into the intake side. No pun intended, but I would exhaust all ignition possibilities before tackling the manifold. Let us know what fixes it.
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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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