This is a high quality 19mm CVK replacement carburetor for all GY6 4-stroke 139QMB 49/50cc Chinese engines. This carburetor is fitted with an 85 main jet. It’s better than stock and boasts a larger venturi and an accelerator pump, which will frequently eliminate hesitation when you open her up. Features: – Accelerator pump – Electric choke (2-pin male plug), – Fuel and drain lines, – Fuel filter – Pre-tuned jetting for most applications. – Quick-drain valve This carburetor is used on Baja, JMstar, Jonway, Lance, NST, Peace, Roketa, Sunl, Tank, TNG, Vento, VIP and many others.