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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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