After installing my new 152G's the tech from Redline said to turn the idle mixture screw 1 1/4 turns out from lightly seated on all 4 screws to start.
Well after reading a bunch of info on the same subject below are 4 instructions for the same process. 2 sites say the older DCOEs have different needle shapes so 1 turn is good while the new versions have a skinnier needle and 2-3 turns out is where to start. Why would the tech at Redline suggest 1 1/4? He knew I just purchased new carbs... (rhetorical)
Anyway, what have most ppl started with for the newer 152G's? I'm leaning toward 2-3 turns out, which is unfortunate since I already spent a ton of time tinkering with other settings after initially setting them 1 1/4 out per Redline :(
Below are the instructions from 4 different sites... BTW, the Datsun site probably had the best Weber DCOE info I've ever come across on web. I've learned more on that one site the all others combined.
TopEnd Performance
DCOE Series and IDF / IDA. On a DCOE or multiple DCOE's you should be between 3/4 turn and 1.5 turns out for all older model DCOE's (DCOE 2, 9, 18, etc.)
and 2 1/4 to 3 turns out for late style DCOES (151 and 152 with air bleed screws under the white caps.)
RedlineWeber
Standard DCOE Settings:
Speed screw ¼ to ½ turn in after contact with lever maximum. Mixture Screw 1 turn out from lightly seated.
Datsun Tech page http://240260280.com/Tech/Carbs/Weber/DCOE Theory Operation and Tuning.html
Early DCOE screws had a wide tapered end that flowed more mixture with just slight movements (turns). Weber later changed DCOE's to a more precise screw with a very narrow taper. The result is that early DCOE screws flowed adequate enrichment at ~ 1 turn out from full stop. Later narrow tapered screws flowed the same amount at ~2.5 turns. Current production DCOE151's have the newer, narrower tapered screws.
Piercemanifold Tech support
...said 1 1/4 turns out from lightly seated.