This workshop manual covers Briggs & Stratton Single Cylinder OHV engines, specifically the horizontal shaft series 110000, 120000, 150000, 200000, and 210000, as well as the vertical shaft series 97700, 99700, 110000, 120000, 210000, 280000, 310000, and 330000. These air-cooled engines are known for their robust engineering and reliable performance across a wide range of applications. This manual provides comprehensive information for maintaining and servicing these versatile power units. The purpose of this manual is to provide detailed guidance for DIY enthusiasts and experienced mechanics alike. It includes in-depth coverage of essential service topics such as the ignition, carburetion, governor, and lubrication systems, along with troubleshooting procedures and a maintenance schedule. Furthermore, it offers detailed instructions and diagrams for engine components including cylinders, bearings, crankshafts, camshafts, pistons, rings, rods, gear reduction systems, charging systems, exhaust systems, fuel filters, pumps, oil coolers, remote control systems, and speed control adjustments. Torque specifications are also included to ensure proper assembly and repair.