Thank You guys, appreciate your replies. I ruled out the cable itself, at the carburetor it is tight there. When engine isn't running it stays in place. It is only when the governor spring is pulled while running, it moves back down to around the middle of the lever. The vibration and the spring pull seems too much pressure for the lever. I think I going to try to remove it and use a vice with some bolts or punches to see if I can tighten that rivet a little, see what happens. I connected a tachometer to engine, the type that wraps around spark plug wire, not the best but gets me into the ballpark.
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