This workshop service repair manual covers the Mercury MerCruiser 41 Turn Key Start (TKS) Carburetors, designed for marine engine applications. It details service and repair procedures for the TKS Carburetor system across various engine displacements including 3.0L, 4.3L, 5.0L, and 5.7L models, compatible with Alpha and Bravo drive systems. This manual is intended to provide comprehensive information for routine and preventive maintenance, aiming to prevent premature failure and ensure optimal performance of your marine engine. The scope of this manual encompasses essential areas such as engine, electrical systems, fuel system diagnostics for the TKS Carburetor, and cooling systems. It includes wiring diagrams and detailed troubleshooting guidance for the TKS Carburetor and Oil Pressure Switch. Designed for a wide audience, from first-time owners to professional technicians, this English-language manual provides all necessary information to perform procedures correctly, ensuring the longevity and reliability of your Mercury MerCruiser marine engine.