This workshop service repair manual covers Briggs & Stratton Twin Cylinder OHV engines, including the 405777 and 445777 Series. These engines are known for their robust design and reliable performance, making them suitable for a wide range of applications. With displacements of 656 cc and 724 cc, they offer ample power for demanding tasks. The engines feature electronic ignition, carburetion fuel delivery, and various lubrication systems, all detailed within this manual to ensure optimal operation. This comprehensive English-language manual is designed for both DIY enthusiasts and experienced mechanics. It provides detailed, step-by-step instructions, illustrations, and diagrams for maintenance, repair, and troubleshooting. Key areas covered include the ignition, fuel, lubrication, and electrical systems, as well as engine components such as the cylinder head, valves, crankshaft, and pistons. Regular maintenance procedures, including tune-ups and service intervals, are thoroughly explained to help you keep your Briggs & Stratton engine running efficiently and reliably.