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Farmall & IHC Tractors Discussion Forum
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Farmall M carb.

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Charles Helwig

03-29-2008 17:54:09




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I am wondering if any body can tell me where to set the adjustment screws on a farmall m carb. I had it running earlier in the winter and it quit get gas so i cleaned it out with 2+2. Now to keep it running i have to have the choke closed at all times. any help would be great.




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Wayne in MN

03-29-2008 18:32:30




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 Re: Farmall M carb. in reply to Charles Helwig, 03-29-2008 17:54:09  
High-speed mixture screw set at 3 turns out, idle air screw set at 1 1/2 turns out.
Start the engine & warm it up in NEUTRAL and BRAKES LOCKED. Run at WOT (wide open throttle) and turn the high-speed adjusting screw in & out to find the "sweet spot" where the engine runs its fastest & smoothest. Turn this high-speed screw out an extra 1/2--3/4 turn for power. Idle the engine down & set the idle rpm's. Now turn the idle air screw in to richen, out to lean so the idle is smoothest (this is an AIR adjusting screw so works opposite of the main fuel screw on the bottom of the carb). Re-adjust the idle rpm's. Repeat the carb adjusting procedure another time to be sure all mixtures are correct.

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