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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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