This comprehensive service repair manual is tailored specifically for 2003 KTM 250, 525 SX, MXC, and EXC racing motorcycles. It provides detailed instructions and high-quality diagrams to guide you through every aspect of engine maintenance and repair.

The manual covers a wide range of topics, including:

* **Service Information** - Essential information to get you started.
* **General Information** - Overview and key aspects of your motorcycle.
* **Removing and Refitting the Engine** - Step-by-step instructions for engine removal and installation.
* **Disassembling the Engine** - Breakdown of the engine components and their functions.
* **Servicing Individual Components** - Detailed instructions on servicing and repairing individual engine parts.
* **Assembling the Engine** - Clear guidance on reassembling the engine after servicing.
* **Electrical System** - Information and instructions related to the electrical components.
* **Fuel System** - Comprehensive information on the fuel system and its maintenance.
* **Technical Specifications** - Complete specifications for your motorcycle.
* **Periodic Maintenance Schedule** - Guidance on regular maintenance tasks.
* **Wiring Diagrams** - Detailed diagrams of the electrical system for troubleshooting.

This manual is an invaluable resource for any owner or mechanic looking to perform engine maintenance or repairs on their 2003 KTM 250, 525 SX, MXC, or EXC racing motorcycle. The clear instructions and illustrations make it easy to follow, regardless of your experience level.

The 2003 KTM 250, 525 SX, MXC, and EXC models represent a pinnacle of performance and innovation in the off-road motorcycle world. These machines are renowned for their exceptional handling, power, and durability, making them a favorite choice for both amateur and professional riders. The SX models are specifically designed for motocross racing, boasting lightweight chassis, powerful engines, and suspension tuned for high-speed agility. The MXC models, meanwhile, are a blend of motocross performance and trail-friendly features, allowing for versatility across various terrains. The EXC models, designed for enduro racing and general off-road use, offer a more robust build with longer suspension travel and a greater focus on comfort and rider ergonomics.

These KTMs are powered by single-cylinder, four-stroke engines known for their smooth power delivery and impressive torque. The 250cc engine offers a nimble and responsive ride, excelling in tight and technical terrain, while the 525cc engine delivers a raw and potent punch, ideal for high-speed sections and demanding courses. All three models share a common design philosophy, featuring lightweight aluminum frames, WP suspension components, and high-quality components throughout. The KTM 2003 lineup represents a culmination of meticulous engineering and race-proven technology, offering riders an unparalleled riding experience. Their reputation for performance and reliability has cemented their status as a leading force in the off-road motorcycle world.