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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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