GY6 50cc (139QMB) 19mm CVK Carburetor with Accel Pump

19mm CVK Carburetor for 139QMB 50cc Scooters

This 19mm CVK carburetor is built for 50cc scooters running the 139QMB engine, aiming to deliver fuel more effectively. Its larger venturi helps the air and fuel mix more thoroughly. Browse our GY6 50cc scooter parts if you need related components. The mechanical float-bowl accelerator pump is intended to reduce throttle hesitation. It works as a direct-fit replacement on several models that use the 139QMB engine.

Improved Fuel Delivery

Compared with stock carburetors, the 19mm venturi increases airflow, which can make the engine feel more responsive. The unit comes with an electric choke that uses a 2-pin male plug, so starting is simpler. It is supplied with a #85 main jet and a #35 pilot jet to set the fuel flow.

Compatibility and Installation

This carburetor works with all 139QMB engine variants, including several engine codes. On the airbox side, the inner diameter is 29mm and the outer diameter is 38mm. On the engine side, the inner diameter is 19mm and the outer diameter is 28mm. It replaces the original carburetor directly, which suits home repair work.

Specifications

• Venturi Size: 19mm
• Choke Type: Electric, 2-pin male plug
• Accelerator Pump: Mechanical float-bowl
• Main Jet: #85 (4mm thread PB style)
• Pilot Jet: #35 (6mm thread CV style)
• Needle: Non-adjustable GY50 A4
• Fits: CSC Go Max

Fitment

Fits:

• CSC Go Max
• Other GY6 50cc (139QMB) scooters

Where it goes: part #1 on the carburetor diagram for the CSC Go Max.

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