I doubt it being that spring in the governor. That spring is moved by the throttle lever and if the spring is broken the throttle lever will not move the carburetor from idle. The one who posted to look to see if the shaft from the governor (enclosed in timing cover) is stuck. That is most likely the problem. I had a Cub to that and a lot of moving with a wrench and lots of penetrating oil got it freed up. The original problem was I installed a radiator with the overfloe tube being in the wrong place spewing water on the front timing cover.
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