: Consists of a main jet (G) and an air correction jet. At cruising speeds, fuel is drawn through the main jet and mixed with air through a calibrated diffuser.
Pre-mixes fuel with air before it enters the main venturi to ensure better atomization.
If you are wrenching on a classic Volkswagen Beetle, a vintage Porsche 356, a Citroën 2CV, a Fiat 500, or a Mercedes-Benz "Pagoda," you have almost certainly encountered a . For much of the 20th century, Solex (established in 1905) was the gold standard for French and German carburetion.
Every time you look at a Solex diagram, trace this path mentally.
: Since the main jet is inactive when the throttle is closed, a separate auxiliary jet (g) provides a concentrated fuel mixture directly behind the throttle plate for steady idling.
Here is the breakdown of every numbered part you would see in an official Solex blue-line diagram.
Before we dive into the brass, let’s address the "why." A Solex carburetor is not a single device but a system of vacuum circuits. Without a visual guide (the diagram), tuning is guesswork. The diagram allows you to:
A butterfly valve at the base that regulates the total volume of the air-fuel mixture entering the engine. How the Solex System Works