Carb question Options

[last337]

Hello everyone! I got my new EMPI 40s on yesterday and I have been going through the adjustment all day today. It has been a long time since I have messed with carbs and Im not sure if I am doing this correct.

Initially I got my linkages all set up and correct with the speed screw at about 1 turn in. I have all the air bleed screws all lightly seated and mixture screws about 1 1/2 turns out.

At this point it is very rich but runs well at an idle of about 900 and actually comes up really nice but is smoking and even spitting out fuel from exhaust. I figured at this point I could begin going in 1/4 turn at a time on each mixture screw to the point the engine starts to run rough then back a 1/4 turn. I did this on all and it was still smoking badly. I havent set timing or anything like that but I would assume the only electrical issue (am I wrong?) that could cause rich conditions at idle would be a fouled plug but it is running smooth and not as if it is missing with a fouled plug.

I am wondering if maybe I should go another half turn on the speed screw then see if I can go in further with the mixture screws. Is there anything I can do with the air bleed to adjust this? I thought they were only adjusted for syncing and not for a rich condition.

The vendor I got them from claims they have the following jets:
52 idle jets
115 main jets
200 air jets
28mm venturi
550 EX. pump jets
50 accelpump jets
F11 emulsion tubes

Am I oversized with that I have in there now? I have been reading the following link to troubleshoot and it says if I am over 1 1/2 turns in on mixture then my jets are too big. The problem is that I cant get it to run at under 1 1/2 turns on mixture. However, maybe I should try another half turn on speed screws?

Any help is greatly appreciated (IMG:style_emoticons/default/biggrin.gif)

[last337]

Thanks for the info! Today I started pulling apart the ignition system to see if poor ignition could have been the culprit. Sure enough, the plugs were as black as they can get. I am planning to go ahead and just change out plugs, wires, cap, rotor, to begin tuning process again.

I do have one question about the air bleed screw. What exactly does that do? When the carbs arrived they were backed out several turns and on first crank it didnt seem to run quite as rich. However, when I began my tuning the 'best lean setting' instructs them to all be seated. When do I adjust them and what will they do? Is that anything that could help with my problem?

Thanks!