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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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