The Jianshe JS250 ATV WD250U, produced between 2002 and 2009, represents a robust all-terrain vehicle designed for utility and recreational off-road use. Known for its reliable engineering and practical functionality, this ATV is equipped to handle various terrains, making it a dependable choice for both work and adventure. Its design emphasizes durability and straightforward operation, offering a capable platform for riders seeking dependable performance in challenging environments. This workshop service repair manual provides comprehensive guidance for the maintenance and repair of the Jianshe JS250 ATV WD250U. It covers essential areas including engine overhaul, transmission and drivetrain service, suspension and steering adjustments, brake system maintenance, and electrical system diagnostics. The manual is structured to assist DIY mechanics and owners, offering detailed, step-by-step instructions, troubleshooting procedures, and clear visual aids like exploded diagrams to ensure efficient and accurate servicing, ultimately helping to maintain the vehicle's optimal performance and longevity.