This master service manual covers the Aquila GV250 and Comet GT250 EFI/GT250R EFI motorcycles. These models represent an offering in the cruiser segment, characterized by their classic styling, V-twin, liquid-cooled DOHC engines, and the efficiency and improved performance provided by Electronic Fuel Injection (EFI). Designed for riders seeking a blend of traditional cruiser aesthetics with modern engine technology, these motorcycles offer manageable performance and a comfortable riding experience. The EFI system contributes to better throttle response, fuel economy, and easier cold starts, making them a compelling choice in their market segment. This comprehensive manual provides detailed guidance for the maintenance, repair, and troubleshooting of your motorcycle. It covers all major systems, including the engine, transmission, chassis, electrical components, and braking system. Within its pages, you will find scheduled maintenance procedures, fluid specifications, diagnostic flowcharts, and step-by-step repair instructions for everything from routine oil changes to complete engine rebuilds. Emphasis is placed on the EFI system, offering insights into its operation and common diagnostic procedures, ensuring that owners, mechanics, and technicians have the necessary information to keep these motorcycles in optimal condition.