This manual provides comprehensive service and repair information for the 1999 125 SX, 200 SX, 125 MXC, 200 MXC, 125 EXC, and 200 EXC models. These performance-oriented off-road motorcycles are renowned for their potent two-stroke engines, advanced suspension systems, and agile handling, making them highly competitive in motocross, cross-country, and enduro disciplines. The commitment to a 'Ready to Race' philosophy is evident in these machines, which were engineered for demanding off-road conditions and built upon a strong racing heritage. The 125cc and 200cc variants offer distinct power delivery characteristics, with the larger displacement providing a noticeable torque advantage, all within a lightweight and robust chassis designed for rider control and durability.

The scope of this repair service manual is extensive, covering all essential aspects required for maintaining and repairing your motorcycle. It includes detailed procedures for engine overhaul, transmission service, suspension maintenance, brake system servicing, and electrical system diagnostics. Within its pages, you will find guidance on routine maintenance, troubleshooting common issues, and in-depth information on component rebuilds, including carburetors and suspension units. The manual is structured to assist both novice owners performing basic upkeep and professional technicians undertaking complex repairs, ensuring the optimal performance and longevity of your 1999 125 or 200cc off-road machine.