Main parts of the Solex "Zenit" 2B4 carburetor:
1 - carburetor base; 20 — 2nd chamber throttle control lever with stop screw; 24 — auxiliary starting device actuator; 28 — mixture quality (composition) adjustment screw; 30 — idle speed adjusting screw; 32 — plug for adjusting screw of mixture quality (composition); 33 — plug of the adjusting screw of the throttle valve of the 2nd chamber; 34 - electromagnetic shut-off valve; 35 - gasket; 40 — starting device housing; 45 — air damper control rod; 46-49 - accelerator pump parts; 50 — pneumatic drive of the air damper; 54 — bimetallic spring housing; 58 - mixture quality composition corrector; 59 — diaphragm and valve of auxiliary starting device; 63 — pneumatic drive of the throttle valve of the 2nd chamber; 65 Throttle control lever; 70 — pneumatic drive of the throttle valve of the 1st chamber; 71 — 1st chamber throttle valve stop screw; 72 — plug of the stop screw of the throttle valve of the 1st chamber; 74 — fuel jet of the transition system of the 2nd chamber; 75 — fuel jet of the partial load economizer; 76 - accelerator pump nozzle; 77-82 — accelerator pump drive parts; 85,86 — accelerator pump control levers; 89 - needle valves; 90 - floats; 93,94 - sprayers; 96,97 - main fuel jets; 97a — fuel jet of the auxiliary starting device actuator; 98.99 - idle emulsion tubes with fuel and air jets of the auxiliary idle system; 100 — auxiliary idle system air jet; 101 — air jet of the transition system of the 2nd chamber; 102 - Main air jet; 106 — screw for fastening the carburetor cover