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 - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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