This Service Repair Workshop Manual covers Kohler K91, K141, K161, and K181 single-cylinder, air-cooled gasoline engines applicable to all years. These engines, known for their reliable performance, feature magneto ignition, forced air cooling, carburetor fuel systems, and splash lubrication. The K91 offers approximately 3.0 HP, the K141 approximately 3.5 HP, the K161 approximately 4.0 HP, and the K181 approximately 4.5 HP, with displacements ranging from 8.27 to 11.03 cubic inches. These robust engines are engineered for durability and efficiency in various equipment applications. This comprehensive manual provides essential information for maintaining and repairing your Kohler engine. It includes detailed step-by-step instructions, clear diagrams, illustrations, and wiring schematics to guide you through all repair procedures from A-Z. Technical specifications and troubleshooting guidance are also included to ensure proper diagnosis and resolution of issues. Designed for owners, mechanics, and technicians, this English-language manual is printable and allows for image enlargement, ensuring all users can effectively perform maintenance and repairs on their specific engine model.