This manual covers the Aprilia MY 660 Engine, a 660cc liquid-cooled, four-stroke, parallel-twin engine. Known for its balance of power and agility, this engine platform, introduced by Aprilia around the 2020/2021 model year, powers various motorcycle models and has been praised for its performance and refinement. It features a DOHC, 4-valve per cylinder design, electronic fuel injection with ride-by-wire throttle, and is capable of producing approximately 95-100 HP. The engine is designed for a compact configuration, weighing approximately 47 kg dry. Aprilia's legacy of performance-oriented motorcycles and racing technology underpins the engineering of this modern engine.

This comprehensive service and repair manual provides in-depth technical guidance for the Aprilia MY 660 Engine. It covers essential maintenance procedures, including oil changes, filter replacements, and spark plug service, as well as major repair operations such as engine rebuilds and valve adjustments. The manual details the engine's mechanical components, fuel, lubrication, cooling, ignition, electrical, and exhaust systems, along with the engine management system. Troubleshooting guides, component testing procedures, and critical torque specifications are also included, making it an indispensable resource for DIY enthusiasts, independent repair shops, and Aprilia motorcycle owners seeking to maintain and repair their vehicles effectively.