I did the same as you at first and changed the air cleaner oil and didn"t look at the pipe, Both my M and H were dirty. The M is tougher to check since it has 14.9 tires and sits way up there. One thing you can do as far as checking the governor and the air pipe at the same time for that matter is just unhook the rubber hose at the carb and drive it. Go up a hill or put some kind of variable load on it like a grader you can raise or lower and listen, does the carb start sucking more air? If it is, then the gov is working and if it sounds the same but slows the gov is the problem. If it runs good like it should and it sucks more air when going uphill then the air pipe is clogged. You will need a flashlight to look way down inside the pipe incase a chunk of crud came loose and plugged up the bottom of the pipe. Those pips get gunk built up as they also suck in oil vapor and stuff from the gov housing and valve cover and then dust that comes in sticks to the oily film in the pipe.
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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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