My take on it is that the Governor may have issues. If the governor rod (that you held to quiet the "lope") is looked at while it is loping, looseness might be observed. The first place to look is the condition of the linkage from the lever (near the front of the engine left side) to the carb, that rod. With the engine off do the following: Move the hand lever at the driver's station to its wide open position. Go to the linkage at the carb on the engine side. Wiggle this rod forward and backward, not side to side. It should feel tight. now move the speed lever to almost idle. wiggle the linkage again. If it is loose, and has free play, the link pins/pivots are worn, and possible the holes in the carb lever and governor lever. Make these pivot points have better closer fit. A fatter rod, welding up the rod end and reshaping, or putting bushings on the linkage is usually needed. This takes out the looseness that can cause this "Loping". If this does not help, or if the linkage is tight in its pivots, the issue may be in sticky governor internal pivot points, wear on those pivots, or a bad governor main bearing. The governor is difficult to remove without removing the radiator. (some say it can be done), I have doubts. If all else fails, it could be the carb, it may have a restriction in the high speed circuit. The load applied slows the engine, the governor correctly gives it more fuel and air to keep the speed steady. The engine over reacts to this and surges.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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