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Farmall & IHC Tractors Discussion Forum
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Screws on M Carb??

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terryjd

07-30-2005 21:10:21




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I was wondering if anybody could tell me what the 3 screws on a M carb do and the best way to set them? Thanks Terry




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RustyFarmall

07-31-2005 05:26:56




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 Re: Screws on M Carb?? in reply to terryjd, 07-30-2005 21:10:21  
Idle speed, idle mixture, and load mixture. The idle speed is self explanatory. Initial settings for the other 2 following a rebuild is 1 1/2 turns out on the idle mix, and 3 turns out on the load screw. The engine must be fully warmed up and running at an idle, turn the idle mix screw either in or out until the engine runs smoothly. The load screw gets a bit more tricky as the engine needs to be under a full load for proper adjustment. Turning this screw in will lean out the fuel mixture, and turning the screw out will cause the engine to have a richer fuel mix.

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