Try re-adjusting the carburetor. This may get rid of your problem. Do you have a lot of humidity where you are located?
Carb adjustment: idle air screw is set at 1˝ turn out to start with; high speed mixture screw is 2˝ or 3 turns out. With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw (on the bottom facing down to the rear) in until the engine begins to starve for fuel. Then turn the screw out until the engine begins to blubber. Now find the "sweet spot" in between the two settings. If you are working the engine (plowing, etc.), then the high speed screw needs to be turned out ˝ turn or more beyond the "sweet spot" to be sure the engine isn"t starving for fuel and can develop its rated power. The same procedure should be followed for idle mixture. On the "H"& “M” carb, the idle mixture screw (faces to the front just below the idle stop screw) is an air adjusting screw so turning in will richen the mixture and out will lean the mixture. Now set the idle stop screw (located where the governor shaft tube attaches to the carb) to adjust the low speed RPM. Repeat the carburetor adjustment procedure again to make sure “all is well”.
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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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