If you've got that left-side linkage set up, I tend to suspect the carb, either the float or a bit of crud that broke loose and got lodged somewhere in the cleaning process.
The only thing that will usually go wrong with a governor in a hurry is the main spring breaking. If it was okay when you took it apart, I wouldn't bother about that.
As far as the bumper spring, (it shouldn't give out suddenly either) you do have the acorn-style jam nut off of it, right? Sillier things have happened, but the adjustment is on what looks like a full-threaded slot-head set screw. It is covered and jammed in place by an acorn nut over the top (or bottom, in this case). If you're trying to turn the acorn nut in to cure the surge, you won't be getting anywhere.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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