Dual carb question, Dellorto 40s on a 1.8L to be exact Options

[terrymason]

The problem - The car will go very lean around 2500 rpm, as if the pump jets were too small.

History:
New fuel pump (3.5 PSI to each carb)
55 idle jets
55 pump jets
140 main jets
175 air correctors
These carbs are new to the car, and I'm trying to dial them in.

The car is lean when I first start it (16 / 17 on my air / fuel gauge), but then levels out to a nice 14.7 idle when warmed up. While driving, I can give the car 20% or so of the pedal, and drive up to highway speeds nicely, but when I goose it, it will go very lean (18-22 on my gauge) followed by a series of backfires and loss of power. I started off with 35 pump jets, and have moved up to 55s, which appear to be the most popular around here. I've also adjusted the pump jet linkage, from the nut fully loosened, and moved it in as far as it would go before affecting the main throttle shaft (like 60 turns or something).

What do you guys think, do I need 75 pump jets?

[rhodyguy]

i'm glad you see what i'm getting at joe. my method just eliminates a step or 2. with the off stop side hanging, you either tighten up or loosen the rod to match the other carb. you can really make minute adjustments. i don't give a shit what one idle screw is doing at this point as long as it's not 'in the way'. it's removed from the equation. when all is said and done, the backed off screw is run in til' it just makes contact and starts to increase the idle speed then off a bit. increasing the idle to stop the indicator in the unisyn from fluctuating is VERY important. you increase yours more than i do. i go just enough to steady the needle. if it dances even the least istsy, bitsy, teeny, tiny bit, i turn the idle up. as stated...do what works best for you. (IMG:style_emoticons/default/wink.gif)

k