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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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