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The spring inside the governor that commonly breaks works AGAINST the governor weights to MAKE the engine "rev". When it breaks, the engine remains at idle and does NOT rev. A worn thrust bearing in the governor or simply a mis-adjusted linkage between the governor arm and the carburetor will cause the "won't idle down" problem, as well as other wear in the governor mechanism and shafts and bushings. (Also, sometimes the throttle butterfly plate screws can come loose, making the butterfly loose on it's shaft. This will cause weird problems, too.) Start by setting the linkage betwen the carburetor and the governor arm, as detailed in the service manual. I wish I was there... I could do it in a few minutes... it's harder to explain than to actually DO. Basically, you want the carburetor butterfly shaft to reach the end of it's rotation in the "wide open direction" JUST BEFORE the governor arm gets to the end of it's movement. Do you have access to a service manual that will give the procedure in more detail? If the linkage is simply "out of adjustment", following the adjustment procedure will be a permanent "fix". If the governor thrust bearing is wearing out, the "adjustment fix" will be temporary, as it will get messed up again as the bearing continues to wear. If you decide to try to remove the governor yourself for repairs, you'll need to rotate the engine to #1 TDC, and note the position of the distributor rotor, and then the drive slot at the rear of the governor shaft... HORIZONTAL, if no one has ever messed with it before. BE SURE you understand how to do this, or you'll be in for a devil of a time getting the ignition system back "in time" after governor repairs. Post back, with any more questions!
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