Is there a dyno handy? The only way to know what the tractor is doing is to load her down and read the HP. Then tweak the timing for almost max HP without detonation. And lean the mixture until it starts to loose a couple of HP. Somebody may have the mixtures screws out too far, the aircleaner plugged, the choke blade not all the way open. You can't tell either unless the hose is pulled off the carb air inlet and you actually look. The centrifugal advance could be stuck as well. Is there an accelerator pump on that carb. Back off on the stroke until the engine almost stumbles on acceleration. Some tinkerers set the stroke as if they were racing the 1/4 mile.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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