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1938 MODELS 301 305 306 307 Z.C. MODEL 20AVX9 DT # DX4686 Z.C. ASSEMBLY # 8401-A HERCULES QXC-3 3 3/8 X 4 1/8 FLOAT SETTING 1 1/2 VENTURI 26 COMPENSATING JET 25 IDLE JET 24 ACCLERATING JET 9 CAP JET 5S FUEL VALVE SEAT 35 CAP JET BASE # 3 PUMP STROKE 3/4 MAIN JET 16 IDLE REV. .012 Z.C. REPAIR KIT # K-8401-A GASKET SET # C181-70 PRIMING PLUG # CR78-17 THROTTLE SHAFT BUSHINGS CR9-22 , CR9-23 INFORMATION FROM ZENITH CARBURETOR MANUAL JAN 1946