50cc Carburetor tuning for Keihin CVK on a QMB139 Chinese scooter engine

Main jet kit: http://www.partsforscooters.com/114-4... Air filter: https://amzn.to/2ref3uw Carburetor: https://amzn.to/2JL7li2 0:00 intro 0:57 Main jet 3:37 Elevation 7:26 Pilot jet 10:00 Idle 11:47 Needle 13:11 Accelerator pump 13:36 Temperature 14:21 Summary This is a complete tutorial showing you how to tune a 50cc Chinese scooter carburetor. I will show you how to select the right jets, check the spark plug, and how to tell if the engine is running too lean or too rich.