I've never worked on a JD carb, but they're made of cast iron, and cast iron can be heated up with a torch in the area of the stuck choke, and then spray some PB Blaster on it as it cools. When the carb is cool to your touch, grab that choke lever with a pair of pliers and begin GENTLY wiggling it back and forth, a little more PB Blaster, and before you know it that choke will be free, and then you can take it all apart. Screws, bolts, etc, and nearly anything else that is stubborn about moving will also benefit from the heat-er-up and cool-er-down philosophy.
Do NOT subject any parts made of aluminum or pot metal to the heat. A venturi made of aluminum or pot metal will just sort of disappear if you get it TOO hot.
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