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Farmall & IHC Tractors Discussion Forum
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Carb adjustment running to rich?

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Mark in Mi

03-30-2004 05:05:49




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Blowing black smoke out exaust. I'm told carb is adjusted to rich. Any info. on proper adjustment for this problem.

Thanks,
Mark




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Wayne Swenson

03-30-2004 07:53:22




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 Re: Carb adjustment running to rich? in reply to Mark in Mi, 03-30-2004 05:05:49  
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 running lean.
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 "H" 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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Mark in mi

03-30-2004 06:46:17




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 Re: Carb adjustment running to rich? in reply to Mark in Mi, 03-30-2004 05:05:49  
Sorry about that, I guess I need another cup of coffee. Farmall H carb. (Not distillet)



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Jonathan Mirgon

03-30-2004 07:13:43




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 Re: Re: Carb adjustment running to rich? in reply to Mark in mi, 03-30-2004 06:46:17  
Yes, coffee does get the brain moving, I usually drink about six cups beffore I am ready to do anything !

Rebuilt carb settings are; --throttle stop 1 1/2 turns in from first contact with throttle rod---Idle needle 1 1/4 turns out from snug seating--main fuel needle 3 turns out from snug seating. Turns being one complete rotation.



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Jonathan Mirgon

03-30-2004 05:46:14




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 Re: Carb adjustment running to rich? in reply to Mark in Mi, 03-30-2004 05:05:49  
What kind of tractor and carb are you working on ?



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