Which jet do you mean? The main jet screw is turned in at full throttle until it stutters, then out until smooth. If it does nothing it is still plugged. Same thing for the idle jet at 600 rpm or so. I have never had the desire to turn out the main jet until it smokes, you want a lean condition, not rich, that is why you turn it IN first and then out until it is smooth, no more than 1/4-1/2 turn after that. This is all in the Operators Manual, which you obviously need. One other thing. The M carb has the choke lever and rod on the outside of the carb, the SM on the inside. If you have an SM carb, forget the main jet adjustment and turn it out 4-5 turns. The SM idle jet is adjusted the same as the M jet.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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