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markr1001 11-24-2007 06:18 PM

mc2150 tuning
ok so i finally got my carb on and it idles like a dream. but when i drive it it is sluggish and just doesnt seem right.

i know im supposed to adjust the screws at the front of the carb, but i dont know exactly what they are supposed to do, i think they are the high and low speed adjustment? it makes it very hard to tune it not knowing exactly what to do.

so if anyone could explain or has a good writeup id be very happy. also i read you can set your timing very close with a vacuum gauge, where do i hook it to do this and what should i be aiming for?

o an my jeep is a 87 yj with the 4.2 and a nutter bypass, i still am useing the stock distributor. and i dont have any emmisions stuff on it at all.

thanx in advance

jdoggmoney 11-25-2007 12:27 AM

Both of those screws are idle adjustment. One for each "barrel". I started at about 2 turns out on mine I think.

Don't know about setting timing with vacuum, but once you have the timing set correctly, you can use a vacuum gauge to set your idel mixture. I don't think there is a black and white method for this. I set mine to max vacuum then screwed them in (I think) 1/8 to 1/4 turn.

I use a light to set timing.

Does it stumble no matter what throttle position is, minus idle, or just off idle? May be the accelerator pump linkage needs a little adjustment. Does it feel like it's starving for fuel, or loading up when it is "sluggish"?

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