Performance Adjustable CARBURETOR with electric choke for 50cc 80cc GY6 Engines Fully Adjustable Carburetor, CVK 50cc/80cc GY6/QMB139 4-stroke engines 2 wire electric choke This carburetor comes with a #78 Main Jet for better fuel to air ratio. Fits 50cc/80cc 4 Stroke GY6/QMB139 Engines. | Increase horsepower and airflow for your vehicle.