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Old 11-22-2010, 08:43 AM   #1
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MC2100 - Fuel/Air mixture screw?...

Hey guys -

Ok, where in the world is the fuel/air mixture screw on this MC2100 carb? I am running pretty lean and need to richen it up a bit, but I can't find the screw anywhere

Thanks -

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Old 11-22-2010, 12:11 PM   #2
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Motocraft carbs have two screws in the front and adjusting them is for the idle circuit only. If your lean on/at highway speeds, that is a function of power circuit, and to change, you need to rejet using the main jets. The idle circuit is only needed until 1500 to 1600 rpms before the power/enrichment circuits take over. Bogging between idle and power is a function of the enrichment circuit (accelerator pump) and if throttle is opened and a jet of fuel comes out of the booster venturi in the throat of the carb, you can assume it's working. Hope this helps pinpoint where your having a problem. Good luck, Fred

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Old 11-22-2010, 12:23 PM   #3
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The issue is starting off. I don't have much power at take off and usually bog down before it takes off. When I drive with the choke on about 1/3, the Jeep runs like a champ! Plenty of power taking off and no bog down. I just assumed that meant I am running lean.

I also have a ticking that may be the timing chain. I have no idea when it when changed last - I am the 3rd or 4th owner. The Jeep's got 190k on the odometer. Could a worn out, stretched timing chain cause me to lose power during accelerating? If so, then I should replace the timing chain, gears, tensioner before I fool with the carb, I would think.
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