If it will pull a continuous heavy load with out a problem for at least 5 minutes you can forget about carburetor problems. Adjusting the idle mixture might help but I doubt it. Main jet is fixed so if you have an adjustable needle on main jet, be it electric shut off or just manual needle, make sure it is turned out five full turns. I would bet your manifold heat riser is not functioning and the intake manifold heat stove inside is full of carbon from years of use. Those engines are noted for being (cold blooded) and if that heat riser is not in good working condition you will have a spitting sputtering son of a gun. Counter weight needs to stand straight up and down under spring tension and be free to move forward near 90 degrees but that doesn't tell you if insides are plugged up. Also, if 263 engine 22 degree spark advance at full throttle, 291 18 degrees.
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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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