Bring sharper throttle response to your big-bore scooter build with the Universal Parts PD20J 20 mm Type-2 Carburetor for compatible 139QMB / QMB139 four-stroke engines. Its accelerator pump supplies extra fuel as the throttle opens, while the electric choke supports cold starting.
This carburetor is primarily suited to 70cc+ big-bore conversions or compatible higher-displacement versions of the 139QMB engine family, with a 20 mm intake bore for increased airflow.
Features
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20 mm Intake Bore: Supports the airflow needs of compatible big-bore engine builds.
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Accelerator Pump: Adds fuel during throttle opening to help improve response.
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Electric Choke: Included cold-start enrichment unit with a two-pin male connector.
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Type-2 PD20J Design: Includes throttle linkage, cable bracket and float bowl.
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Supplied Jetting: #78 main jet and #33 idle jet provide a starting point for tuning.
Specifications
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Brand: Universal Parts
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Part number: 151-222
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Manufacturer part number / model: PD20J
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Carburetor type: Type 2, with accelerator pump
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Intake bore: 20 mm inner diameter
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Engine-side mount: 28 mm outer diameter
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Air-filter mount: 38 mm outer diameter
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Electric choke connector: Two-pin male plug
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Main jet: #78
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Idle jet: #33
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Country of origin: China
Model Fitment
For compatible 139QMB / QMB139 four-stroke engine configurations. Typically used with 70cc+ big-bore kits rather than as a universal stock-50cc replacement.
| Make |
Models / engine applications |
| Baja |
SC50, SC50-P |
| Baotian |
BT50QT-11 |
| Panterra |
Freedom 50cc, Fusion 50cc, Retro 50cc |
| Qingqi |
QM50QT-4G, QM50QT-6V |
| Schwinn |
Hope 50, Laguna 50 |
| Boss, CFMoto, Kymco, Lifan, SUNL, Tank, Vento, Verucci, Wildfire, X-Treme |
Compatible QMB139-equipped applications |
| Other makes |
Matching 139QMB / QMB139 four-stroke builds |
Match the 28 mm engine-side mount, 38 mm air-filter connection, throttle cable and linkage, choke connector, hose routing, and available clearance before ordering. The model list identifies engine-family applications, not guaranteed drop-in fitment for every year or configuration. Adjust jetting and fuel mixture for your displacement, intake and exhaust setup; supplied jets are not a guarantee of correct tuning for every build.
This product is intended for off-road use only. This product is not intended for use on public roads or land.