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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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