Our Major Carburetor rebuild kit for the Zenith "K" series (K5) Carbs found on the U and UC models is the Cat's ass! We give you everything needed to completely rebuild & restore that old Zenith! Gaskets, O rings, throttle shaft. You name it, it's in there! A hard to find kit for a hard to find Carburetor! We have em' in stock!  Don't guess! Get the best! B&B Fuel Service Parts!!