This document provides essential technical information for Kohler single-cylinder, air-cooled, 4-cycle gasoline internal combustion engines. It covers engine models K91, K141, K161, K181, K241, K301, K321, and K341. These engines are designed for a variety of applications requiring reliable power. This factory service repair manual offers comprehensive guidance for the upkeep and restoration of these robust power units. The purpose of this manual is to serve as a definitive resource for maintaining and repairing Kohler engines. It includes detailed step-by-step procedures for assembly and disassembly, engine rebuilding, ignition system service, and fuel system service. With troubleshooting guides, detailed diagrams and illustrations, part identification, and torque specifications, this English-language manual is an indispensable tool for owners, mechanics, and technicians to ensure optimal performance and longevity of their Kohler engines.