This service repair manual covers Kohler single-cylinder, air-cooled, four-stroke gasoline engines, specifically models K91, K141, K161, K181, K241, K301, K321, and K341. These engines, known for their robust design and reliable performance, are utilized across a wide range of equipment. While specific production years are not detailed, the manual addresses the engineering and operational characteristics common to these versatile power units, offering insights into their construction and intended applications. The purpose of this comprehensive English-language manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of the specified Kohler engine models. It includes essential information on lubrication, servicing procedures such as air filter maintenance, valve adjustments, and carburetor cleaning, as well as troubleshooting guidance. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their Kohler engines.