Re: Airflow-constricting flange inside my carb...
DO NOT REMOVE THAT FLANGE !!!!!!!!! That flange is what is called the venturi of the carburetor , as air flows through the venturi it speeds up causing an area of low pressure, which at high engine speeds causes fuel to be sucked through the main jet. Engine vacuum only sucks fuel from the carb at low speeds because at high speeds there is very little intake vacuum. Your engine will run seriously lean at high speeds if u remove this flange. Hope I am not to late responding here , hate to see ya ruin a perfectly good carburetor , or even worse an engine from running too lean. The best thing to do would be to get a larger carburetor if seeking more power , the carburetor throat size and venturi size are matched to make the carb work .