This Service Repair Manual covers the Kohler LH630 and LH775 engines, which are 4-stroke, air-cooled, single-cylinder internal combustion engines designed for gasoline fuel. These engines, manufactured by Kohler Co., feature electronic ignition, a mechanical governor, and an Oil Sentry system for enhanced reliability and performance. With displacements of 633 cc for the LH630 and 775 cc for the LH775, these engines are engineered for durability and efficient operation in various applications. This manual provides comprehensive guidance for the maintenance and repair of your Kohler engine. It details essential procedures, including recommended oil types (SAE 10W-30 and SAE 30), oil capacities for both models, and specific spark plug recommendations (CHAMPION RC12YC and NGK BKR5E). Technical specifications, troubleshooting information, and safety guidelines are also included to ensure proper upkeep and operation, assisting owners and technicians in maintaining optimal engine performance and longevity.