Installing and Adjusting Dual Carburetors
Procedures for adjusting dual Zenith, Solex, Weber and other carburetors can be found in a variety of books, articles, and manuals. Searching the internet will yield good instructions and tutorials for dual carburetors in general and the particular types used on old Porsches. Below are a few sources, just click on the associated link to locate them.
1. Porsche Workshop Manual pages on Zenith carburetors.
2. Zenith 32NDIX tuning article from the Porsche 356 Registry site.
3. Solex 40PII-4 tuning article from the Porsche 356 Registry site.
4. Pelican Parts Technical Article on carburetor adjustment, balance, and tuning.