This manual pertains to the Aprilia motorcycle, powered by the Rotax 123 engine. This engine, a single-cylinder, 2-stroke unit, was a popular choice for Aprilia during the late 1980s and 1990s, featuring in models such as the AF1, early RS 125, and Tuareg 125. Known for its performance in the small-displacement segment and its motorsport heritage, the Rotax 123 typically offered around 15-25 horsepower and utilized a 6-speed sequential manual transmission with a wet multi-plate clutch. Its robust design, when properly maintained, contributes to a generally reliable reputation.

This comprehensive workshop service and repair manual provides in-depth technical data for the Rotax 123 engine. It covers essential maintenance procedures, including oil changes, spark plug replacement, and air filter servicing, as well as detailed instructions for major repairs such as engine disassembly and reassembly. The manual also offers systematic troubleshooting guidance for common running and electrical issues, highlights special tools required for specific tasks, and lists crucial torque specifications. This resource is designed to assist professional motorcycle mechanics and experienced DIY enthusiasts in maintaining and repairing the vehicle effectively, ensuring its longevity and optimal performance.