Main parts of the Pierburg 1B3 carburetor: 1 - carburetor body; 2 - carburetor cover; 3 - needle valve; 4 - float; 5 - float chamber gasket; 6 - main fuel jet; 7 - idle fuel jet; 8 - fuel jet economizer; 9 - electromagnetic shut-off valve; 10 - idle mixture quantity adjusting screw; 11 - adjusting screw for idle mixture quality (composition); 12 - throttle valve limit screw; 13 - accelerator pump; 14 - accelerator pump nozzle; 15 - Automatic starting device; 16 - accelerator pump drive lever; 17 - Throttle control levers and sectors; 18 - power mode economizer