When you say it "loads up" do you mean it smokes black and loses power, or does it lose power and stumble under load with no black in the exhaust?
If the former be looking for float level set too high, a float pontoon cracked/flooded, possibly an orifice ("jet") loose inside the float bowl, etc.
If the latter I'd start with the governor. Make sure it's opening the throttle plate the full 90 deg with the governor handle pulled back and the engine stopped.
Another thing to check is the spark timing - both at slow and max idle RPM. It should be at TDC at low idle and advance to 35 deg or so at speed. If it's not find and fix the cause before messing with the carburetor.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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