The 2003 Aprilia Leonardo is a mid-size scooter designed for urban commuting and light touring, blending sporty aesthetics with practical functionality. Known for its comfortable ergonomics and capable performance within its class, the Leonardo was Aprilia's entry into the premium maxi-scooter segment. It offers significant underseat storage and is powered by a four-stroke, liquid-cooled, single-cylinder engine, available in 125cc, 150cc, and 250cc variants. This model represents a refined platform from the Italian manufacturer, renowned for its racing heritage and performance-oriented vehicles.

This comprehensive service and repair manual provides detailed information for the 2003 Aprilia Leonardo 125, 150, and 250 models. It covers a wide range of topics, including engine overhaul, fuel and cooling system maintenance, electrical diagnostics, transmission service, and brake system repairs. The manual includes procedures for routine maintenance, troubleshooting common issues, and component rebuilds, offering in-depth technical specifications and diagnostic guidance. It is designed to assist owners, mechanics, and technicians in maintaining, troubleshooting, and repairing the vehicle effectively, ensuring optimal performance and longevity.