Starting car for first time, baseline setting on carbs Options

[MattR]

Im about ready to start my 914 for the first time and break in the motor. I have a set of 40 idfs on there that im guessing are out of adjustment. How many turns out should I set the needles at to get it to fire? I know I have to tune it during break in, but Im just trying to get it to start up now. Hints? Thanks.

Edit: i should have clarified. This is a 2056, dual 40 idfs, raby split duration cam.

[lapuwali]

There is no "main needle".

The parts on the jet stack (the two in the center of the carb, between the throats) are, the air correction jets (175-200 are typical sizes, lower number is RICHER), the emulsion tube (F7 and F11 being the only one's I've heard used on the T4), and the main jets (125-135 are common sizes, lower numbers are LEANER). None of these really have any effect until 2500-3500rpm. Below that, you're primarily on the idle jets. They're behind screw-head holders on the exterior sides of the throats, same side as the adjustment screws and the accelerator pump. 50 and 55 are the only sizes for idles usually seen, lower numbers are LEANER.

The idle mixture screws are the larger adjustment screws at the base of each throat, with the springs. Out (anti-clockwise) is richer. 2.5 turns out is the usual setting to start from.

The smaller screws (with the locknuts) are air bypass adjustments, to adjust how much air is allowed to sneak past the closed throttle plate. These are used to sync one carb throat against the other on one carb.

The last adjustment is the throttle stop screw, with a spring, on one end of the carb, which is used to set idle speed, and sync one carb against the other at idle.

The 175 numbers are probably air correction jets, at that's about the richest one normally used on these engines. It primarily controls mixture above 4500rpm.