This Service Repair Workshop Manual provides comprehensive guidance for the OHV Single Cylinder engine, designed for a variety of applications requiring robust and reliable power. These engines are engineered with versatility in mind, available in both horizontal and vertical configurations to suit diverse equipment needs. Covering a broad range of models including the 110000, 120000, 150000, 200000, 210000 series for horizontal applications and the 97700, 99700, 110000, 120000, 210000, 280000, 310000, and 330000 series for vertical applications, these engines are built for durability and efficient operation. Their mechanical governor systems and carburetor fuel systems ensure consistent performance across various operational demands. The purpose of this English-language manual is to equip owners, technicians, and mechanics with the necessary knowledge to perform maintenance, repairs, and diagnostics on their OHV Single Cylinder engines. It covers essential areas such as safety precautions, routine maintenance procedures to prevent premature failure, detailed troubleshooting steps, and in-depth explanations of various engine systems including fuel, lubrication, and starting. With clear instructions and technical specifications, this manual serves as an indispensable resource for ensuring the optimal performance, longevity, and reliability of your engine.