The Aprilia Pegaso 650, produced in 1997, is a versatile adventure touring motorcycle known for its robust engineering and adaptability. Featuring a liquid-cooled, four-stroke single-cylinder Rotax engine with a displacement of 652 cc, it delivers reliable performance suitable for both commuting and extended journeys. Its design incorporates a steel tubular frame and long-travel suspension, enhancing its capability for varied terrain, including light off-road excursions. This model, often sharing its engine with the BMW F650 Funduro, offers a blend of Italian styling and functional practicality, positioning it as a capable choice in the dual-sport segment. This comprehensive service manual provides in-depth guidance for the maintenance, repair, and troubleshooting of the Aprilia Pegaso 650 (MZ model code). It covers all essential systems, including the engine, fuel, transmission, electrical, braking, and chassis components. The manual details routine maintenance procedures, such as oil changes and filter replacements, alongside advanced diagnostics and repair instructions for engine overhauls and electrical system issues. With over 300 pages of information, including detailed diagrams and specifications, this English-language resource is an indispensable tool for owners and technicians seeking to preserve the performance and longevity of their 1997 Aprilia Pegaso 650.