Universal Parts 20mm PD20J CVK Carburetor - 139QMB

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.

Key Features

• 20 mm Intake Bore: Supports the airflow needs of compatible big-bore engine builds.
• Accelerator Pump: Adds fuel during throttle opening to help improve response.
• Electric Choke: Included cold-start enrichment unit with a two-pin male connector.
• Type-2 PD20J Design: Includes throttle linkage, cable bracket and float bowl.
• Supplied Jetting: #78 main jet and #33 idle jet provide a starting point for tuning.

Technical Specifications

• Brand: Universal Parts
• Part number: 151-222
• Manufacturer part number / model: PD20J
• Carburetor type: Type 2, with accelerator pump
• Intake bore: 20 mm inner diameter
• Engine-side mount: 28 mm outer diameter
• Air-filter mount: 38 mm outer diameter
• Electric choke connector: Two-pin male plug
• Main jet: #78
• Idle jet: #33
• Country of origin: China

Compatibility

For compatible 139QMB / QMB139 four-stroke engine configurations. Typically used with 70cc+ big-bore kits rather than as a universal stock-50cc replacement.

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.

• Electric choke with two-pin male connector supports cold starting
• Accelerator pump adds fuel during throttle opening for improved response
• 20 mm intake bore for compatible 139QMB big-bore builds
• Supplied #78 main jet; tune for the engine configuration
• Supplied #33 idle jet; Type-2 PD20J design

Brand: Universal Parts; Part number: 151-222; Manufacturer part number/model: PD20J; Type: Type-2 carburetor with accelerator pump; Intake bore: 20 mm ID; Engine-side mount: 28 mm OD; Air-filter mount: 38 mm OD; Electric choke connector: two-pin male; Main jet: #78; Idle jet: #33; Country of origin: China; Typical application: compatible 139QMB/QMB139 70cc+ big-bore builds; Fitment and jetting checks required; Off-road use only

Compatible 139QMB/QMB139 four-stroke configurations, typically 70cc+ big-bore builds: Baja SC50/SC50-P; Baotian BT50QT-11; Panterra Freedom/Fusion/Retro 50cc; Qingqi QM50QT-4G/QM50QT-6V; Schwinn Hope 50/Laguna 50; compatible QMB139-equipped Boss, CFMoto, Kymco, Lifan, SUNL, Tank, Vento, Verucci, Wildfire and X-Treme applications; confirm 28 mm engine-side and 38 mm air-filter mounts, cable/linkage, two-pin choke connector, hose routing and clearance; adjust jetting to the build