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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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