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Carburetors

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Carburetor and Intake Carburetors Intake Manifolds Reed Valves and Petals Carburetor Accessories Jets Fuel System Air filter Injection System
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Carburator type
Gurtner Mikuni TM Mini 4-stroke PHBG PHBH PHBL PHBN PHDG PHVA PHVB Polini CP PWK TK VHST
Carburetor diameter
12mm 14mm 15mm 16mm 17,5mm 17mm 18mm 19mm 21mm 22mm 23mm 24mm 25mm 26mm 28mm 30mm 32mm 33mm 34mm 35mm 38mm
Brand
Dell'Orto Keihin Malossi Mikuni MotoForce MotoForce Racing MXS Custom Naraku Piaggio Polini Stage6 Stage6 R/T Standard Parts Top Performances
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Standard Parts
Carburetor Motoforce 22mm GY6 50cc Euro 4
Article no.: MF16.13903

Carburetor Motoforce 22mm GY6 50cc Euro 4

84,00 €
Currently not in stock
Polini
Carburetor Kit Polini CP 21 Yamaha BWs
Article no.: P177.0093

Carburetor Kit Polini CP 21 Yamaha BWs

230,00 €
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265,00 €
-13% Discount
Standard Parts
Carburetor 21 PHBG metal flange
Article no.: CGN525523

Carburetor 21 PHBG metal flange

41,50 €
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Polini
Carburetor Polini PWK 30
Article no.: P201.0169

Carburetor Polini PWK 30

110,00 €
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Carburetor Polini PWK 28
Article no.: P201.0168

Carburetor Polini PWK 28

121,00 €
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Carburetor Polini PWK 24
Article no.: P201.0166

Carburetor Polini PWK 24

110,00 €
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129,00 €
-15% Discount
Piaggio
Carburetor Keihin CVK-18 Z61F Piaggio Liberty 50 4T
Article no.: OE-PIACM141914

Carburetor Keihin CVK-18 Z61F Piaggio Liberty 50 4T

234,00 €
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Naraku
Carburetor 18mm Naraku V.3 GY6 / Kymco / Piaggio / Peugeot 50cc 4T
Article no.: NK200.01

Carburetor 18mm Naraku V.3 GY6 / Kymco / Piaggio / Peugeot 50cc 4T

51,50 €
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Dell'Orto
Carburetor Dellorto 14mm PHVA QD Piaggio original
Article no.: L-DEL8374
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Carburetor Dellorto 14mm PHVA QD Piaggio original

98,00 €
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Dell'Orto
Carburetor Dellorto 12mm PHBN cable choke
Article no.: L-DEL3069
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Carburetor Dellorto 12mm PHBN cable choke

110,00 €
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Carburetor PHBH 28
Article no.: CGN478722

Carburetor PHBH 28

99,00 €
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Dell'Orto
Carburetor Dellorto PHBG 21 AS metal flange
Article no.: L-DEL2557

Carburetor Dellorto PHBG 21 AS metal flange

108,00 €
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Dell'Orto
Carburetor Dellorto PHBG 15 AS
Article no.: L-DEL2518

Carburetor Dellorto PHBG 15 AS

122,00 €
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Naraku
Carburetor Naraku 24mm 85cc-180cc 4T GY6 139QMB / 139QMA
Article no.: NK200.06
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Carburetor Naraku 24mm 85cc-180cc 4T GY6 139QMB / 139QMA

49,00 €
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Stage6
Carburetor 21 PHBG Stage6
Article no.: S6-31PHBG-21
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Carburetor 21 PHBG Stage6

119,00 €
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132,00 €
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Standard Parts
Carburetor 18mm TKSVB 50cc 4T Euro 4
Article no.: SP-33222

Carburetor 18mm TKSVB 50cc 4T Euro 4

148,00 €
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Scooter carburetors: the complete guide

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.

What is a scooter carburetor and how does it work?

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.

Main Carburetor components

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:

  • Float chamber and float: the float chamber stores fuel, and the float keeps the level constant via a needle valve.
  • Jets: Meter the fuel. The main jet controls high RPMs, the idle jet controls low RPMs. The needle regulates mid-range throttle.
  • Carburetor needle: Connected to the slide, regulates the fuel flow in the mid throttle range.
  • Slide: Controls the air flow depending on the throttle position. Designs include round, flat, or diaphragm slides.
  • Choke: Helps with cold starts, manually or automatically. Often omitted on racing carburetors.

Carburetor types for 50cc scooters: original, sport and racing

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.

✅ Carburetors by application:

ORIGINAL CARBURETOR (OEM)

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.

  • Diameter: 12-17.5 mm
  • Advantages: Affordable, durable, street-legal, low fuel consumption
  • Use: Standard engines, original components
  • Recommended: OEM carburetors, Dell'Orto, Gurtner, Motoforce standard

SPORT CARBURETORS

For lightly tuned engines. They improve flow and response without compromising low-end performance.

  • Diameter: 17.5-21 mm
  • Advantages: Better throttle response, acceleration and top speed compared to OEM carburetors.
  • Use: Standard to lightly tuned setups(50-70 cc cylinders, sport exhaust, pod air filter)
  • Recommended: Dell'Orto PHVA, PHBN, PHBG 19-21, Stage6, Motoforce Racing, Voca Racing

HIGH-PERFORMANCE Carburetors: RACING & High-End

For high-performance setups and racing. They supply engines with larger displacement with maximum flow and direct throttle response.

  • Diameter: 19-38 mm
  • Advantages: Maximum flow, very direct throttle response and maximum precision at all RPMs
  • Use: Heavily tuned engines with large displacement, racing exhaust, tuning reed valve with carbon petals and racing air filter.
  • Required: Experience in carburetor tuning and professional setup
  • Recommended: Keihin PWK, Dell'Orto VHST, Mikuni TM, Stage6 R/T, Polini CP Evo.

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.

✅ Carburetor by slide type

  • Round slide: The most common design for scooter carburetors. It moves vertically and is controlled via the throttle cable. Provides direct response, easy tuning with needles of different tapers and high reliability. Carburetor models such as Dell'Orto PHBG and Polini CP use this system.
  • Flat slide: Shortens the intake path and improves the air flow. This ensures even more direct throttle response, more precise fuel metering and better top-end performance - ideal for sporty setups and performance-oriented engines.
  • Diaphragm slide: Is not controlled directly via the throttle cable, but via a diaphragm that reacts to the vacuum generated by the engine. The carburetor automatically adjusts the mixture supply to the engine's actual requirements, resulting in smooth running, lower fuel consumption, and progressive throttle response (less sporty). Found mainly on Keihin CV carburetors and many factory 4-stroke Chinese scooters.

Carburetor Tuning and 50cc scooter Performance: everything must fit

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.

Key principles before tuning

Before you delve into specific combinations, you should know the basic principles:

  • Air flow: Filter, intake manifold, carburetor, cylinder and exhaust form a flow chain. Any bottleneck limits performance.
  • Balance between low vs. high RPM: Large carburetors favor high RPM but hurt low-end response. Choose based on intended use (city vs. track).
  • Carburetor tuning: Every change to components (cylinder, exhaust, filter) changes the air-fuel mixture. Readjusting jets and needles is essential.
  • Avoid bottlenecks: The most restrictive component determines maximum power. A 28 mm carburetor with a standard 24 mm intake manifold makes no sense.

In short: Only an integrated, balanced tuning approach allows all components to work in harmony and fully exploit the scooter’s potential.

Carburetor adjustment and maintenance

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.

the correct carburetor setting

An incorrect mixture has a direct impact on performance and reliability:

  • Too rich (too much fuel): High consumption, blue-white smoke, black and oily spark plug, loss of top-end power, exhaust dripping oil.
  • Too lean (too little fuel: Overheating, knocking, white or porcelain-like spark plug, high risk of piston seizure, loss of power.

There are several indicators for correct adjustment: spark plug colour (tan is ideal), smooth RPMs, fuel consumption, temperature and throttle response.

step by step Caruretor Adjustment

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:

  • STEP 1 - Main jet (high RPM): Start with a noticeably oversized main jet, so that the engine runs too rich and starts to stutter - similar to riding with choke. Gradually select smaller main jets until the engine runs smoothly. Take a test ride after each change. If the engine drops RPM under quick throttle, the mixture is too lean. If the setting is approximately correct, drive a few hundred meters at full throttle and then switch off the engine immediately. Then check the spark plug: If it is black, the mixture is still too rich and you need a smaller jet; if it is white, the mixture is too lean and there is a risk of piston sticking; a light brown / tan colour is optimal.
  • STEP 2 - Needle (mid range): Ride at half throttle and listen for the engine: If the engine stutters or runs erratically, the mixture is too rich and the needle is set one notch lower; if it stalls or loses power, the mixture is too lean and the needle is set higher. If the engine runs smoothly and consistently in the mid-range, the setting is correct.
  • STEP 3 - Air mixture screw (low RPM): From idle, open throttle sharply: If response is delayed or uneven, turn the screw 1/4 turn. Note: Open screw = leaner, closing screw = richer. Adjust gradually until the engine responds immediately and cleanly.

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.

Carburetor maintenance

A carburetor only delivers optimum performance if it is clean and correctly maintained.

  1. Regular cleaning: Remove the float chamber, clean the jets with compressed air or carburetor cleaner, check the float and needle valve. Dirt in the jet ducts changes the metering.
  2. Clean air filter: A dirty filter reduces the air flow and richens the mixture. Clean or replace depending on use (more frequently in dusty environments).
  3. Correct fuel level: Check the float level. If the level is too low, the mixture can become lean and lead to engine damage.
  4. Check gaskets and hoses: Incorrect air (leaks, cracked hoses) also leans the mixture. Inspect and replace seals regularly.
  5. Condition of slide and needle: Wear on the needle or slide changes the carburetor setting in the mid RPM range. Replace if there is play or signs of wear.

After long storage: Old fuel can clog the jets. There are two cleaning methods:

  1. Option 1: With fuel additive to dissolve deposits without disassembly.
  2. Option 2: Complete removal and cleaning with special products and a fine brush. Always check components for wear.

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.

overview: Flange types, connections and diameters

When changing the carburetor, the correct fit on the intake manifold is crucial. There are three main variants:

✅ Rubber flange

Flexible connection, dampens vibrations, very common on scooters.

Connection widthCarburetor
24-25 mmDell'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 mmMikuni TM 24 mm, Dell'Orto PHBL 20-26 mm
35-36 mmKeihin 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 mmKeihin 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.

✅ Clamp flange

Rigid connection with metal clamp, e.g. for Dell'Orto PHBG and Polini CP.

Connection widthCarburetor
16 mmSHA 13 mm, Gurtner 12 mm
24 mmDell'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.

✅ Screw flange

Hole spacingCarburetor
34 mmGurtner 12 mm (original Peugeot)
42 mmOriginal Kymco, Honda, Daelim, Sym, Suzuki

Mounting tips

  • Identify flange type: Rubber flange, metal clamp, srew-on
  • Measure the inside diameter of the intake manifold / flange and the connection width of the carburetor
  • Select a suitable model
  • After installation, check for air leaks: start the engine and spray a bit of brake cleaner around the connections. If the engine RPM fluctuates, there is an air leak.

Our range: Carburetors and spare parts for scooters

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.

✅ Carburetors - top brands

We work with recognized manufacturers in the industry and guarantee quality, performance and durability.

  • Stage6: For racing and high performance, with advanced technology and lightweight materials.
  • Dell'Orto: PHBG, PHBN, PHVA, VHST, PHBL. Italian reference for all applications.
  • Polini: CP and PWK (24-30 mm), robust and compatible with sport and racing setups.
  • Mikuni and Keihin: Japanese high-end technology for demanding 2T engines.
  • Motoforce Racing: Excellent value for money.
  • Other brands: Malossi, Gurtner, Voca Racing; all for specific applications and proven performance.

⚡ There are also complete carburetor kits with carburetor, intake manifold and matching reed valve to simplify the search for individual parts.

✅ Spare parts and individual components

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.

✅ Tools and maintenance

Why buy from us?

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:

  • Permanent stock of the most popular brands
  • Fast shipping
  • Technical advice on choosing the right carburetor
  • Quality guarantee on all products
  • Competitive prices

Discover our range now and take your scooter to the next level.

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