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Farmall H Carburator Adjustment screw settings.

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Dan

04-06-2004 07:54:11

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Does anyone know the correct air and main adjustment screw setting for a 44' H with firecrater pistons on new overhaul. i have the tracotor running but i dont know if i am running to rich or to lean. and if i am getting the most horsepower out of my engine. thanks.

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Old Dutch

04-07-2004 18:25:03

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Re: Farmall H Carburator Adjustment screw settings in reply to Dan, 04-06-2004 07:54:11

Hi Dan: The way I have always adjusted them is, after you have it warmed up properly, adjust the idle screw air adjustment, nearest the carb attatchment to manifold for proper running or idle. Then open the throttle to wide open, or high idle. Now you would run the high speed screw or lower adjustment screw angling up into carb from bottom, the one with a brass nut over it, in until it just starts to begin running lean-as cutting out or backfiring to some extent, then back it out from three fourths to one full turn. If you are still running into a lean condition such as popping or backfiring turn it out a quarter turn as needed. Then readjust the idle air adjustment again at low idle. Hope that helps. Always make sure that timing is correctly set. OLD DUTCH

OLD DUTCH

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Wild Horses

04-06-2004 10:18:29

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Re: Farmall H Carburator Adjustment screw settings in reply to Dan, 04-06-2004 07:54:11

Somebody correct me if I'm wrong, but I assume it's the same as an M. 3/4-1 turn out on the idle screw & 3 turns out on the power screw, both from seat. The idle screw is the needle valve that angles down from the front outside. The power screw is the one out the front of the bowl. These are just starting points. You will have to adjust and play with the settings to get the best results. YOu can do this by ear or on a dyno.

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