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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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