Posted by Steve@Advance on June 26, 2022 at 19:33:40 from (99.190.215.237):
In Reply to: JD MT Running Rough posted by Bobl1958 on June 26, 2022 at 13:42:27:
Revisit the ignition system first, check the distributor for side play in the shaft. If there is any looseness the points will not stay set and do strange things.
Do try the old condenser, look everything over closely for bad connections, shorted wiring, etc.
Feel the coil after it acts up. A proper coil will be about the same temperature as the surrounding components. If it's hot to the touch, it's failing or the wrong coil.
Finally, have a clean glass ready, remove the carb drain plug, catch the flow in the glass. It should start with a full flow, slow some as the bowl empties, but continue to flow a steady stream, not slow to a drip or stop. There should be a screen in the elbow going into the carb, it may be clogged. Look at what is caught, be sure it is clean and water free. Also try loosening the gas cap, the vent may be clogged.
Have you checked the air cleaner? It may be clogged with mud dobbers or bird/rat nests.
One other possibility, sticking valves. Though unusual, they can intermittently stick but usually they have to be worked loose if stuck open. Might take a look, they may be rusted and dry.
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