Solex 32 DISTA

After engine has been started, manifold vacuum, acting on choke piston, opposes spring tension. As spring gradually becomes warmer, it tends to wind, reducing tension applied to hold choke plate closed. Choke piston is then able to keep choke plate completely open. Because of designed leakage past choke piston, heated air is continuously being drawn through automatic choke. Air is heated in a heat exchanger installed in exhaust manifold, and connected to carburetor by a hot air tube, and cold air tube.