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Hallo, I have the problem that my Roadster is drinking too much. I opened the Zenith-2 at least 10 times and put the float higher or lower. Set the level with gauge tube. Have changed all the jets against the set of Snyder. Then the nozzles built by David Renner. The GAV valve fitted. All holes cleaned with drilling cabel. All parts with ultrasonic and dish tabs.
The idling air nozzle is 3/4 open, the GAV <1/8 open.
For 100 km I use 20 liters. That's 12-13 miles per gallon.
Ignition perfect with stroboscope, new spark plugs iridium, compression 4 bar, oil consumption 1/2 quart / 500 ml.
Without airfilter, the car runs a little faster (unimportant) but even more rough.
Therefore, I would like to stop experimenting and replacing nozzles, but perhaps try a complete different carburetor.