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1970 914 -6 Carb Jetting for 2.7 RS with Weber Carbs

Fuel System

Vehicle Information: Model: 1970; Year: 1973; Body Type: Targa; Engine (type, size, modifications): 2.7 RS w/ Webers; Total Mileage: 2500;

I wrote previously asking about jetting for my 2.7 RS with Weber carbs due to poor idle and part throttle running. I have since dismantled the carbs and this is what I found: It has 135 Main jets. 55 idle jets. 185 Air Correction jets, and the Emulsion tubes are a riddle: it has F21 tubes on the end barrels of the carbs but F26 tubes in the center barrels. My questions are these: 1. Are F21 and F26 very close? what is the difference? The Weber book has two seemingly differing recommendations on Emulsion tubes.I think I will just change to one or the other, whichever is richer.2. The Weber manual I have recommends increasing the value of the Main jet by 60 to get an approximate value for the Air Correction jet. In experimenting with the Mains, should I stay at 60 above every time I change the Mains? (keeping in mind that the Weber Book recommends 128 Main jets with a 2.7 and 32mm venturis). I plan to install 150 Mains and 60 or 65 Idle jets as you suggested in reply to my first inquiry. I just want to make sure I have the Air Correction jets in the ball park.

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