Does it run poorly uphill without the mower, as well? I think that's how I read it.
The high speed jet is simply a small channel for fuel in the carburetor that supplies fuel when the tractor is running above low idle. On most of the carbs on the smaller Farmalls, it is simply that, a hole of a specific diameter machined into the body of the carb, that can get clogged or choked with varnish from old gas that has been allowed to accumulate. On the smaller tractors, there is an adjustment screw (with a spring under the head of the screw) for the IDLE jet, but none for the high-speed jet. On a few, there will be, in addition to the idle jet, which is usually near the upright throat of the carb, a screw (again with a spring under the head) for adjusting the high speed fueling rate, which, if there at all, is usually nearer the bottom of the carb. Look it over and let us know what you have.
As far as intake, that's the entire system that starts at the top of your air cleaner, and runs through the side of the air cleaner to the carb (where the fuel is added to the air), then out the top of the carb into the manifold, through the "arms" of the manifold to the head, then through the valves where the air/fuel mixture is drawn into the cylinder on the intake stroke of the piston. The trouble spots are at the joint between the carb and manifold and the manifold and the head. The problem could be that the joints aren't bolted tightly down, or deterioration of the gaskets at each joint. An easy test for that is to spray something combusible like crb cleaner around the outside of those joints with the tractor running. Any leak will draw the spray in and increase your engine speed. If no difference, you can assume they are not the problem.
For all that, it could very well be a problem with the governor. It could be as simple as an adjustment in the linkage between the governor and the carb (easily fixed and should be checked first anyway) or a matter of wear or a broken spring (the latter a good possibility if the tractor had run okay in the past and this came up suddenly) in the governor.
I'd suggest you check the intake issue first and let us know how you make out. If that doesn't take care of it, we can get on to helping with governor issues.
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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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