I adjusted the linkage according to the Ford manual. Throttle set to high and hold the carb full open. If you can slide the arm on easily, it is correct, in not then adjust. It sounds like this is the same procedure you recommended.
The surging was far worse as in it would just surge all the time until I adjusted the governor to carburetor linkage. So that definitely helped. It now only does it if I initiate a speed change, or the load on the engine changes significantly.
The carburetor is new and almost certainly after market. It was on the tractor when I purchased it. I only ran the tractor for a little while when I got it as there was a knocking coming from the bottom end. It turned out to be an oil pickup that had been bent into the crankshaft. It looks like the tractor was high centered as the oil pan was dented in.
I tried a new after market carburetor and the behavior is the same. It has never not surged since I have had it.
The carburetor mainjet is currently 1 turn out. This is the recommended starting position. I will try to enrichen and see if the smooths out the surge.
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