Are you sure it opening and closing when the engine is running? There is an aerodynamic load on the "butterfly" when it's running and it wants to stay wide open so you have to work against a "lift" force to close it. Some of these choke butterflies have a "pressure relief door" on them that allows a big reduction in air flow and then it pops open to suddenly admit more air to a cold engine on a choked start. If you have one of these you have to make sure that it's not staying open when you choke it. You should be able to make the engine die with full choke.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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