The question is after you stop a bit and take the load off will it then recover on its own and pull good again for a bit? If so that is a a fuel delivery problem. Do you know about the fine strainer screen in the fitting on the carb where the fuel line attaches? See link. Checking the flow out of the drain on the carb you should run over a pint measure in 2 and 1/2 minutes and you cannot count the first 8 to 10 seconds that drains down the fuel in the carb bowl. That is 3 gallon an hour. Test says the M used 3.75 GPH under full load, it will probably use a bit more since it has probably been overhauled at some point with over bore pistons. It you pull the line off the carb and open the shut off valve. It should flow out of that line similar to a good 2 - 3 beer experience in bathroom. Check down through the fill neck in the bottom of your gas tank with a good flashlight for crud that can block the top of the sediment bowl.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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