Genuine Keihin Carburetor for Kymco, SYM and other high quality scooters with GY6 or QMB139 Engine.  Keihin invented the CVK carburetor, and the quality of this carburetor is visibly superior to the cheap copies you see offered today. Keihin and Mikuni are the OEM supplier of carburetors to Honda, Yamaha, Suzuki, Kawasaki, Kymco and many other big names in powersports.