WEBER conversion kit Solex 4A1 carburetor BMW 320/520 1990CC 1977-83 Auto choke
Upgrade or replace your BMW’s original Solex 4A1 carburettor with a genuine Spanish Weber carburettor, designed and calibrated for perfect fitment and performance.
This automatic choke replacement kit is tailored specifically for BMW 320 and 520 2.0L (1990cc) 6-cylinder models manufactured between 1977 and 1982.
Key Features:
- Complete replacement kit for Solex 4A1 carburettor.
- Fits original manifold and air filter (adaptors included).
- Includes all nuts, bolts, washers, gaskets, and fully jetted for the engine—no extra tuning required.
- Supplied with comprehensive fitting instructions; ideal for DIY installation.
- Tested and calibrated at Webcon’s Sunbury facility for reliable performance.
Calibration / Jetting Specifications:
| Component | Primary | Secondary |
|---|---|---|
| Choke | 27 | 27 |
| Aux Vent | 4.0 | 4.0 |
| Main Jet | 145 | 145 |
| Emulsion Tube | F50 | F50 |
| Air Corrector | 175 | 175 |
| Idle Jet | 55 | 55 |
| Pump Jet | – | 60 |
| Pump Back Bleed | – | 45 |
| Float Height (no gasket) | 40 mm | – |
| Float Travel | 52 mm | – |
| Fast Idle | 0.6 mm | – |
Why Choose This Kit?
- Designed for direct fitment with minimal modification.
- No specialist carburettor knowledge required—perfect for DIY mechanics.
- Reliable, high-quality genuine Weber carburettor.
- Everything you need is included in the kit.
Suitable For:
- BMW 320 2.0L 6-cylinder (1977–1982)
- BMW 520 2.0L 6-cylinder (1977–1982)
For best performance, we recommend fitting one of our electric fuel pump PAFWFP17303 with this kit.
PAFClassic 🇬🇧, official distributor of WEBER and WEBCON brand products.All the carburetors we offer are genuine WEBERs manufactured in the Magnetti Marelli licensed production plant in Spain.We have access to over 11,000 references (carburetors and spare parts) as well as the WEBER technical library so that we can provide you with the parts you are looking for for your carburetors.Make sure you always buy genuine WEBER products like the ones we offer, because copies of these legendary carburetors are now flooding the market.Often offered at very attractive prices, these copies are often of average manufacturing quality and are not always compatible with genuine WEBER parts (jet sizes for example), therefore not allowing them to be calibrated correctly for your car.
