The carburetor is the central component of the intake system and is responsible for fuel-air mixture preparation; it has a major impact on your scooter's performance and throttle response, both on 2-stroke and 4-stroke engines. Whether as a reliable replacement carb like the Dell'Orto PHBG for standard 50cc engines, as a tuning upgrade with a Stage6 Racing or Polini CP Evolution or for fine-tuning your existing carburetor - this guide will help you make the right choices.
The range covers everything from affordable OEM carburetors to professional racing kits, suitable for popular models such as Yamaha Aerox, Piaggio Zip, Peugeot Speedfight, Kymco Agility and many more. Here you'll find all the information you need to find the right carburetor and get the most out of your scooter.
The carburetor generates and regulates the air-fuel mixture allowing the scooter engine to run efficiently and smoothly.
As air flows through the carburetor, a vacuum is created that draws fuel through the jets. When you open the throttle, the slide rises, allowing more air in, while the carburetor adds more fuel. The main jet, idle jet and needle control the mixing ratio depending on the engine speed and load. The result: clean combustion, stable performance and direct throttle response.
A high-quality, properly tuned carburetor ensures noticeably smoother engine running, increased power and a more precise handling.
To tune the engine accurately, you need to understand the carburetor’s individual parts. Each component has a specific function and must match your scooter setup:
The choice depends on the intended use, the engine setup and your personal experience. There is no "best" carburetor, only the most suitable carburetor for each purpose.
Factory-installed carburetors are tuned for a balance of fuel efficiency and reliability. Original or OEM-quality replica carburetors are ideal replacements for 50cc scooters for daily use in city traffic.
For lightly tuned engines. They improve flow and response without compromising low-end performance.
For high-performance setups and racing. They supply engines with larger displacement with maximum flow and direct throttle response.
Note on legal compliance: Carburetors over 17.5 mm can cause problems with street-approval for 50 cc vehicles. Always observe the regulations for road traffic.
The performance of a 2-stroke or 4-stroke scooter depends not only on the carburetor, but also on how the entire engine works as a unit. A too-large carburetor on a stock engine or a too-small carburetor on a racing cylinder reduces performance and increases risk of engine damage. Carburetor, air filter, intake, exhaust, and cylinder must be balanced. Only a coherent overall setup maximizes engine potential.
Before you delve into specific combinations, you should know the basic principles:
In short: Only an integrated, balanced tuning approach allows all components to work in harmony and fully exploit the scooter’s potential.
A poorly tuned high-end carburetor can perform worse than a correctly adjusted standard carburetor. Correct mixture can be checked via spark plug, engine behavior, fuel consumption, and throttle response.
An incorrect mixture has a direct impact on performance and reliability:
There are several indicators for correct adjustment: spark plug colour (tan is ideal), smooth RPMs, fuel consumption, temperature and throttle response.
Correct carburetor adjustment is crucial to achieve maximum performance without risk. Always work top-down: High RPM first, then mid RPM and finally low RPM. Proven method:
Signs of optimal adjustment: Smooth, constant engine at all RPMs, light brown plug after full-throttle run.
Pro tip: Always have a set of spare main jets (±2-3 sizes), as temperature, altitude and humidity affect the carb settings. On cold days, a richer mixture may be necessary; in hot weather or at high altitudes, a leaner mixture may be better.
A carburetor only delivers optimum performance if it is clean and correctly maintained.
After long storage: Old fuel can clog the jets. There are two cleaning methods:
Note: Modern fuels (with ethanol and additives) degrade rather quickly and are not ideal for 2-stroke engines that are not used for long periods of time. If your scooter is not used for several months, the fuel degrades, becomes sticky and can clog channels and jets. This leads to starting problems and poor engine running. In older engines, these fuels can also attack seals and rubber parts. To prevent damage and avoid costly carburetor cleaning, you should avoid leaving fuel in system long-term; run the engine regularly or start occasionally.
Cleaning intervals: Every 6–12 months under normal use; earlier in dusty environments or after long storage.
When changing the carburetor, the correct fit on the intake manifold is crucial. There are three main variants:
Flexible connection, dampens vibrations, very common on scooters.
| Connection width | Carburetor |
| 24-25 mm | Dell'Orto PHVA/PHBN/PHBG 12-21 mm, Polini CP 17.5-21 mm (Ø25.5 mm), Gurtner and Weber 12-16 mm, Arreche 16-21 mm |
| 31 mm | Mikuni TM 24 mm, Dell'Orto PHBL 20-26 mm |
| 35-36 mm | Keihin PWK 19-30 mm (Ø35 mm), Dell'Orto VHST 24-28 mm (Ø36 mm), Dell'Orto VHSH 30 mm (Ø36 mm), Dell'Orto PHBH 26-30 mm (Ø35 mm) |
| 40 mm | Keihin PWK 30-36 mm, Mikuni TM(X) 32-35 mm |
Note: The connection diameter is measured on the carburetor. The rubbers are usually slightly smaller as they stretch slightly during installation.
Rigid connection with metal clamp, e.g. for Dell'Orto PHBG and Polini CP.
| Connection width | Carburetor |
| 16 mm | SHA 13 mm, Gurtner 12 mm |
| 24 mm | Dell'Orto PHBG 15-21 mm, Polini CP 15-21 mm, Arreche 16-21 mm |
Important: Also available in 23 mm. Measure and, if necessary, use a suitable adapter to guarantee a perfect fit and avoid leaks.
| Hole spacing | Carburetor |
| 34 mm | Gurtner 12 mm (original Peugeot) |
| 42 mm | Original Kymco, Honda, Daelim, Sym, Suzuki |
In our online store, you will find a huge selection of carburetors, spare parts and accessories for scooters of all brands. From OEM parts for standard scooters to racing components for extreme racing setups: everything you need to get maximum performance from your scooter.
We work with recognized manufacturers in the industry and guarantee quality, performance and durability.
⚡ There are also complete carburetor kits with carburetor, intake manifold and matching reed valve to simplify the search for individual parts.
All spare parts are available individually or as kits to keep the carburetor in perfect condition:
Thanks to detailed exploded views, you can find the right spare parts quickly and easily.
Choosing the right carburetor is important, but professional advice is just as crucial. Our catalog is specifically tailored to 50cc scooters, mopeds, and small motorcycles, with trusted brands and a wide selection of compatible spare parts.
We work exclusively with recognized manufacturers, provide technical guidance, and maintain a permanent stock of the most common carburetors and parts for maintaining stock engines or upgrading to sport/racing setups.
Our shop offers:
Discover our range now and take your scooter to the next level.
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