Dellorto carburettor jets, chokes and calibrated parts are essential to achieve precise fuel delivery and optimal performance in classic Dellorto carburettor powered engines. Dellorto have been making carburetors in Italy since 1933 and are still in production today. They are known as ‘master casters’ and their carburettors are of the highest quality. They have made carburettors for lawnmowers, go carts, cars, motorcycles and motorsport applications. Dellorto no longer make carburettors for cars but they still manufacture some parts.
We specialise in Dellorto classic car carburettors such as the DHLA, DRLA, DHLB, FRPA etc. We have an extensive range of calibrated parts including main jets, idle jets, air corrector jets, emulsion tubes, chokes, needle valves etc. for the more popular Dellorto car carburettors. We aim to supply top quality Dellorto jets and calibrated parts – and original where possible. We can also assist you in the custom calibration of Dellorto DHLA and DRLA carburettors.
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We supply a comprehensive selection of genuine Dellorto jets, chokes, and calibrated parts or high quality remanufactured parts designed specifically for popular carburettor models like DHLA, DRLA, DHLB, FRPA etc.
These components allow you to fine-tune your carburettor setup to match your engine’s specific requirements, whether you’re aiming for smoother idling, improved throttle response or maximum power at higher RPMs.
All Dellorto jets, chokes and calibrated parts offered by Classic Carbs UK are genuine factory-tested components or high quality remanufactured components, ensuring precision and dependable operation.
With expert support and worldwide shipping, Classic Carbs UK offer Dellorto carburettor jets, calibrated parts and restoration tools, helping you achieve reliable performance and drivability for your classic or high-performance engine.
A comprehensive selection is available including main jets, idle jets, air corrector jets, pump jets, choke tubes (venturis), emulsion tubes and idle jet holders for popular Dellorto models such as DHLA, DRLA, DHLB, FRPA etc.
Identify the exact model and model series of your carburettor; this will be cast and/or stamped on the carburetor body or stamped on an aluminium identification tag held down by one of the carburettor screws (these often get lost in time).
Once you have identified your carburettor, try and obtain the original, correct Dellorto factory specification for your exact model which will provide you with the original calibration, jet and choke sizes and also the part numbers of each component; this will help you order the correct parts. If you need help with this, feel free to contact us.
The ideal jet and choke size depends on your engine’s displacement, modifications and intended use.
Choke (venturi) size is particularly important, as it determines airflow and influences power delivery. For example, smaller chokes improve low-end response, while larger chokes favour top-end power. Starting with standard sizes for your carburettor and engine, then fine-tuning based on performance and spark plug readings, is a common approach.
Rolling road tuning or open road testing can be useful for refining your carburettors calibration.
• Main jets control fuel delivery at mid to high throttle.
• Idle jets manage fuelling at low speeds, idle and transition between idle and main circuits.
• Air corrector jets fine-tune the mixture at higher RPMs.
• Pump jets deliver extra fuel during rapid throttle openings for smooth acceleration.
• Pump rod geometry affects fuel volume deliver through the pump jets (to be considered when calibrating these carburettors).
Symptoms like bogging, hesitation or running too rich or too lean may indicate a need to adjust jet or choke sizes. Engine modifications or changes in fuel type and altitude can sometimes require recalibration.
Yes, Dellorto carburettors are designed for straightforward maintenance. Most jets and chokes can be accessed and swapped with basic tools, making tuning and servicing convenient.
This usually means the mixture is too lean, possibly due to undersized jets or air leaks. Try increasing the size of the idle or main jets, and check for any intake vacuum air leaks around the intake manifold, associated vacuum hoses and ceiling gaskets.
Possibly. Changes in altitude, exhaust, camshafts, or other engine modifications can require different jet sizes and possibly choke tube adjustments to maintain the correct air-fuel ratio and optimal performance.
