This Service Repair Workshop Manual provides comprehensive information for Kohler engines, specifically covering the K91, K141, K161, and K181 models. These single-cylinder, air-cooled, L-head engines are known for their reliable performance across various applications. The K91 offers approximately 3.0 HP with a 9.0 cu. in. displacement, while the K141 provides around 5.0 HP from 14.0 cu. in. The K161 delivers approximately 5.5 HP from 16.0 cu. in., and the K181 offers up to 6.0 HP with a 18.0 cu. in. displacement. This manual is designed to be an essential resource for maintaining and repairing these robust engines. The purpose of this manual is to offer detailed guidance for all repairs, covering every aspect of engine maintenance and servicing. It includes essential technical specifications, high-quality pictures, and diagrams to aid understanding. Owners, mechanics, and technicians will find detailed procedures for routine maintenance, troubleshooting common issues, and performing in-depth repairs. Specific recommendations for service intervals, oil types, and oil capacities are provided within the manual, tailored to each engine model, ensuring optimal performance and longevity.