This manual covers the TTR250 motorcycle, produced from 1999 to 2006, including early (4GY) and later (4RR) chassis code variants. The TTR250 is a capable dual-sport machine, known for its air-cooled, 4-stroke, SOHC engine which provides a balance of reliability and performance for both on-road and off-road excursions. With a displacement of 249 cc, it features a Mikuni VM28 carburetor and a CDI ignition system, paired with a 6-speed sequential transmission and a wet, multiple-disc clutch. Its robust construction and reputation for quality engineering make it a dependable choice for riders seeking versatility. This comprehensive service repair manual provides detailed information essential for the maintenance and repair of your TTR250. It covers all major systems, including the engine, drivetrain, chassis, and electrical components, with step-by-step instructions for routine servicing, diagnostics, and complete repairs. Whether you are performing basic fluid checks, engine rebuilds, or troubleshooting electrical issues, this manual offers factory-level knowledge. It is designed for owners, independent mechanics, and technicians, ensuring that all procedures are clearly explained with supporting illustrations and specifications, enabling efficient and accurate work.