Weber Jets, Chokes & Calibrated Parts

Our Range of Weber Calibrated Parts

Our Weber calibrated parts range covers every essential component for precise carburettor tuning and reliable engine performance.

• Main jets are available in a wide selection of sizes. They are responsible for delivering the correct amount of fuel during mid to high RPM operation, ensuring your engine receives optimal fuelling under load.
• Idle jets supply fuel at low engine speeds and part throttle, which is crucial in smooth idling and the transition to the primary circuit.
• Air corrector jets meter the air mixed with fuel at higher RPMs, allowing fine adjustment of the air-fuel ratio for top-end performance, helping to prevent lean conditions at sustained high speeds.
• Pump jets provide an extra burst of fuel during sharp throttle openings, eliminating flat spots and ensuring crisp throttle response; we offer multiple types and sizes for various Weber carburetor models, including replacements for discontinued types.
• Emulsion tubes blend air and fuel to create an emulsion which is then fed through the idle and main jets into the engine. They are available in different sizes and types.
• Needle valves regulate the incoming fuel flow and fuel volume coming into the carburetor. They also maintain stable fuel levels in the fuel chamber. They are available in different types and sizes.
• Choke tubes, also known as venturis, are interchangeable inserts that control the velocity of air entering the carburettor, directly influencing fuel atomisation and engine response; we supply a wide range of sizes to match your engine’s specific needs. Not all Weber carburettors have the option of interchangeable chokes; some are permanently fixed.
• Auxiliary venturis are smaller, secondary venturis positioned at the centre of the main venturi. Their main function is to accelerate airflow through the carburettor and create a strong local vacuum, which helps draw fuel from the float bowl into the airstream.
• Pump spill valves regulate fuel transition between pump diaphragm or pump plunger and the pump jet.
• Pump rods determine how much fuel is discharged from the pump jet. It is their operating length / stroke which determines the fuel volume.
• Idle jet holders support the idle jet. Sometimes their function also involves emulsifying fuel with air, so can be considered as a calibrated part. Only a few Weber carburettors use these as a calibration part e.g. the Weber 48 IDA.

For convenience and comprehensive tuning, we also supply jet kits tailored for popular WEBER carburettor models such as DCOE, DGV, IDF and others. These kits contain a selection of main, idle, and air corrector jets to cover a range of tuning scenarios.

All our products are precisely calibrated for reliable performance that you can trust for both classic car restorations and high-performance engine builds.

Key features of Weber Calibrated Parts

Weber calibrated parts offer precision tuning, allowing you to tailor fuel delivery for every stage of engine operation, using a system of interchangeable jets and chokes (venturis). This means you can achieve optimal performance from idle to full throttle.

• Precision Engineering: Weber jets are crafted with exacting standards to ensure consistent calibration and fuel delivery.
• Versatility: suitable for various Weber carburettor models, including DCOE, DGAV, IDF, and more. Weber jets are often interchangeable between Weber carburettor models. Please check compatibility before purchasing.
• Performance boost: improve throttle response and fuel efficiency with correctly calibrated jets.
• Durability: made from high-quality materials.

No matter if you are restoring an old classic or building a race car, Weber offers a variety of calibrated parts which make it easy to adjust your carburettor(s) for any engine and driving situation. You can configure your carburettor with ease to match modifications, higher altitudes or different fuels.

With correctly sized calibrated parts, you will experience enhanced performance, including smooth transitions between idle, acceleration and cruising, while eliminating flat spots and maximising power output.