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Farmall & IHC Tractors Discussion Forum
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Farmall M Carburator

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Leonard

07-05-2004 06:46:00




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How do you set the carburator on a Farmall M tractor?




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Wayne Swenson

07-05-2004 07:34:27




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 Re: Farmall M Carburator in reply to Leonard, 07-05-2004 06:46:00  
I am presuming you are referring to the mixture adjustment proceedure. Here you go.
With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw in until the engine begins to starve for fuel. Then turn the screw out until it begins to blubber. Now find the "sweet spot" in between the two settings. If you are working the engine (plowing, etc.), then the high speed screw needs to be turned out 1 turn or more to be sure the engine isn't starving for fuel and can develop it's rated power.

The same proceedure can be followed for idle mixture with the addition of the ldle stop screw to set the low speed RPM.
On the "M" carb, the idle mixture screw is an air adjusting screw so turning in will richen the mixture and out will lean the mixture.
Aren't carbs fun!!

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Harley1983

07-05-2004 11:30:19




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 Re: Re: Farmall M Carburator in reply to Wayne Swenson, 07-05-2004 07:34:27  
The top screw, sticking in at an angle kind of toward the front side of the carb, turn all the way in, then out 1 1/2 turns. The screw on the bottom front of the carb, screw it all the way in, then our three full turns and lock with the lock nut. This always works about right for all of mine, Harley



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