The Yamaha TT-R250, also known by its nickname TT250R, is a dual-sport motorcycle produced between 1999 and 2006. Designed for both off-road trail riding and recreational dual-sport use, it is celebrated for Yamaha's characteristic robust engineering and reliability. This model builds upon Yamaha's legacy of capable off-road machines, offering a balance of trail performance and potential street legality. Its four-stroke, 249cc liquid-cooled engine, typically featuring a four-valve DOHC design, provides manageable power suitable for a range of riders. This comprehensive factory service repair manual provides essential information for the maintenance, troubleshooting, and repair of the Yamaha TT-R250 models from 1999 through 2006. It covers all major systems, including detailed engine mechanicals, fuel and electrical systems, transmission, drivetrain, suspension, and braking components. The manual includes routine maintenance procedures, in-depth engine rebuild instructions, suspension overhaul guides, carburetor tuning, and electrical diagnostics, all supported by critical technical specifications, torque values, and wiring diagrams. This resource is invaluable for owners and technicians seeking to ensure the longevity and optimal performance of their TT-R250.