This digital workshop repair manual provides comprehensive guidance for the Jawa 250 (Type 353) and Jawa 350 (Type 354) series motorcycles, likely covering their primary production years from the mid-1950s to the early 1970s. These robust, air-cooled, two-stroke motorcycles, originating from Czechoslovakia, were known for their ruggedness, simplicity, and affordability. The 250cc models typically featured a single-cylinder engine producing around 14-15 hp, while the 350cc variants offered a parallel-twin configuration with approximately 18-22 hp. Both models utilized a 4-speed manual gearbox with a wet multi-plate clutch and drum brakes for stopping. This manual serves as an indispensable resource for owners, mechanics, and technicians, offering detailed, step-by-step instructions for maintenance, troubleshooting, and repair. It covers all major systems, including the engine (disassembly, assembly, inspection), fuel system, ignition system, transmission, electrical system, chassis, brakes, and bodywork. Procedures range from routine checks and lubrication to complete engine and gearbox rebuilds, as well as guidance for restoration. The manual's comprehensive nature, equivalent to professional technician resources, aims to empower users to efficiently maintain and repair these classic Jawa motorcycles, saving on service costs and preserving their operational integrity.