This is a high quality 18mm CVK replacement carburetor for all GY6 4-stroke 139QMB 49/50cc Chinese engines. This carburetor is fitted with a #85 main jet. This is better than stock and comes with a larger venturi, an accelerator pump, and quality construction. This carburetor is used on Baja, JMstar, Jonway, Lance, NST, Peace, Roketa, Sunl, Tank, TNG, Vento, VIP and many others.

Mechanic's Note: This is better than the stock carburetor! It comes with an accelerator pump, which will frequently eliminates hesitation when you open her up.

Auto choke

Accelerator pump

Venturi: 18.5mm

Airbox side: OD 40mm, ID 35mm

Engine side: OD 28mm, ID 18.5mm



Main: 80 or 85 (4 mm thread PB)

Pilot: 35-38 (6 mm thread CV)

Needle jet: Non-adjustable JH 2mm thick x 43mm (tip to seat)

Compatible jets:

Main: PB style (JETKH1)

Pilot: CV Style

You-All Carburetor (CV, 18mm, w/ Accelerator Pump); QMB139

Complete Carburetors

Other products by You-All
  • SKU1300-1115
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Retail Price: $51.00
Your Price: $51.00
In Stock
This product is not intended for use on public roads or land.
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