Just realize, all gasoline the engine burns goes through the main jet on that carburetor. No other way for fuel to get to the idle circuit at low speeds or main nozzle at higher speeds. So, if you turn the main adjusting screw all the way in and it does not kill the engine that means the needle is not going into the main jet and closing it off. There are different length needles that came with power inprovement packages and the fire crater package had a different taper on the jet and needle so now days there are all sorts of combinations out there. Just turn main needle in with engine warmed up, full throttle until it starts to lean out and back it out about half turn for starting point. Also, many M's have a calibrated main jet just like later models so turning it out twenty turns will not increase fuel flow above what about 4 turns will.
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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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