This workshop service and repair manual provides comprehensive guidance for JAWA 250 and 350 model motorcycles, including those designated with model codes 353 and 354. Primarily produced from the mid-1950s through the 1960s, these iconic Czechoslovakian two-stroke, air-cooled single-cylinder machines are celebrated for their engineering quality and reliability. This manual is an invaluable resource for enthusiasts and independent workshops aiming to maintain, diagnose, and repair these classic motorcycles, offering factory-level accuracy and depth of information essential for preserving their legacy. This manual covers a wide array of systems and procedures necessary for the complete upkeep of JAWA motorcycles. Within its pages, you will find detailed instructions for engine and powertrain components, fuel and ignition systems, clutch and gearbox operations, suspension and steering, braking systems, and the electrical system. It includes routine maintenance schedules, in-depth engine overhaul procedures, transmission and clutch repair, suspension and steering maintenance, and electrical troubleshooting. Technical specifications, torque settings, fluid recommendations, and clear, high-resolution diagrams are provided to assist owners and technicians in performing all necessary service and repair operations with precision and confidence.