This comprehensive service repair manual is your essential guide to maintaining, servicing, diagnosing, and repairing your GPR 125-250CC Derby motorcycle. Developed for professional technicians, this manual provides detailed, step-by-step instructions and repair information covering a wide range of topics. From general information and periodic maintenance schedules to tune-up procedures, engine diagnostics, fuel and lubrication system troubleshooting, electrical system analysis, chassis adjustments, and servicing information, this manual equips you with the knowledge and guidance to handle a variety of repair and maintenance tasks. It's the ideal resource for both experienced mechanics and DIY enthusiasts seeking to understand and effectively work on their GPR 125-250CC Derby motorcycle.