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PZ21 20mm Carburetor for Yamaha PW50 PY50 QT50 1981–2009 Mini Dirt Bike
PZ21 20mm Carburetor for Yamaha PW50 PY50 QT50 1981–2009 Mini Dirt Bike
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Product Overview
Replace a worn, clogged, leaking, or poorly performing carburetor with this PZ21 20mm carburetor, designed for select Yamaha PW50, PY50, QT50, pocket bike, mini dirt bike, and 50cc 2-stroke motorcycle applications.
The carburetor controls the air and fuel mixture entering the engine. A properly working carburetor can help improve starting, idle stability, throttle response, fuel delivery, and acceleration. If your mini dirt bike has hard starting, rough idle, poor throttle response, fuel overflow, hesitation, or sluggish acceleration, replacing the carburetor may help restore smoother engine performance.
This replacement carburetor features a 20mm manifold intake diameter and a 30mm air filter outside diameter. Please compare your original carburetor size, intake manifold, air filter connection, throttle cable setup, choke style, fuel inlet position, and overall shape before ordering.
Product Compatibility
| Make / Platform | Model / Application | Year Range | Engine / Type | Fitment Notes |
|---|---|---|---|---|
| Yamaha | PW50 / PW 50 | 1981–2009 | 50cc 2-Stroke Mini Dirt Bike | Main fitment; confirm intake, air filter, and throttle cable setup |
| Yamaha | PY50 | Select applications | 50cc 2-Stroke Mini Bike | Verify original carburetor size and mounting style |
| Yamaha | QT50 / QT 50 | Matching applications | 50cc 2-Stroke Mini Bike / Moped | Fitment must be confirmed by size and connection points |
| Mini Dirt Bike | PW50-style Applications | Matching 50cc applications | 2-Stroke | Fits only if original carburetor uses matching PZ21-style setup |
| Pocket Bike | 50cc Small Engine Applications | Universal-style fitment | 2-Stroke | Match by manifold intake diameter, air filter side, and throttle cable |
| Small Motorcycle | 50cc Mini Bike Applications | Universal-style fitment | 2-Stroke | Confirm original carb shape and cable/choke layout before ordering |
Important Fitment Note:
This part is not selected by model name alone. PW50, PY50, QT50, pocket bikes, and mini dirt bikes may use different carburetors depending on year, market, intake manifold, air box, throttle cable, choke style, and engine setup. Please confirm your original carburetor matches the PZ21 style, 20mm manifold intake diameter, 30mm air filter outside diameter, and overall connection layout before ordering.
Specifications
| Specification | Details |
| Product Type | Carburetor / Carb |
| Carburetor Model | PZ21 |
| Intake / Manifold Diameter | 20mm / 0.78" |
| Air Filter Outside Diameter | 30mm / 1.18" |
| Compatible Engine Type | 50cc 2-Stroke Small Engine |
| Main Compatible Models | Yamaha PW50, PY50, QT50 |
| Application | Mini Dirt Bike / Pocket Bike Fuel System |
| Fuel System Function | Air and Fuel Mixture Control |
| Fitment Type | Replacement, match by size and setup |
Key Features
- PZ21 20mm replacement carburetor for select Yamaha PW50, PY50, QT50, and 50cc mini bike applications
- Helps restore smoother starting, idle stability, fuel delivery, and throttle response
- Suitable for replacing old, clogged, leaking, or damaged carburetors
- Helps atomize the air and fuel mixture for stable combustion
- Durable construction helps resist rust and normal fuel-system wear
- Designed for pocket bikes, mini dirt bikes, and PW50-style 2-stroke small engines
- Direct replacement style, but original intake size, air filter size, throttle cable, and choke setup must be checked before installation
OEM Cross Reference
No confirmed OEM part number is provided from the supplied product information.
Please use the carburetor model, intake diameter, air filter connection size, throttle cable setup, choke type, fuel inlet position, and original carburetor shape for fitment confirmation. If your original carburetor uses a different intake size, air filter connection, cable end, choke design, or mounting style, this part may not fit.
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Fitment FAQ
Will this part fit my specific model and year?
This carburetor is intended for Yamaha Models: PW50 (1981–2009), QT50 Yamahopper (1979–1992).; Clone Models: PY50, G50T, and various 50cc 2-stroke "Peewee" dirt bike clones.; Engine Type: 50cc 2-Stroke Air-Cooled Engines.. Key physical/spec details from the product data include Manifold Intake Diameter: 20mm (0. 78"), Air Filter Interface (OD): 30mm (1. 18"), 20mm. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this carburetor, also compare the intake diameter, outlet diameter, flange/bolt spacing, choke type, throttle-cable connection, fuel/vacuum ports, and engine displacement. This is especially important for Yamaha PZ21/PW50/PY50/QT50 models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this carburetor for machines outside the listed compatibility, or for units with different intake sizes, cable/choke styles, flange spacing, jetting requirements, or fuel/vacuum port layouts. Model years outside 1981–2009, 1979–1992, 1981, 2009, 1979 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the intake diameter, outlet diameter, flange/bolt spacing, choke type, throttle-cable connection, fuel/vacuum ports, and engine displacement. Recheck listed specs such as Manifold Intake Diameter: 20mm (0. 78"), Air Filter Interface (OD): 30mm (1. 18"), 20mm. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.