This comprehensive KTM 400-660LC4 2003 Repair Manual provides detailed instructions and technical information covering all aspects of your motorcycle's repair and maintenance. This manual is the same one used by professional mechanics and workshops, ensuring you have access to the same high-quality information. With detailed illustrations, diagrams, and step-by-step explanations, you can confidently tackle any repair or maintenance task, even with limited mechanical experience. The manual is organized for easy navigation, covering everything from general information and basic maintenance to in-depth explanations of specific systems, including:

* **Frame, Body Panels, and Exhaust System:** Learn about the structure and components of your motorcycle's frame, body panels, and exhaust system.
* **Maintenance:** Understand routine maintenance procedures, including oil changes, filter replacements, and other essential tasks.
* **Lubrication:** Get comprehensive guidance on proper lubrication for all components.
* **Cooling System:** Learn about the cooling system's operation and how to diagnose and repair any issues.
* **Fuel System:** Explore the intricacies of your motorcycle's fuel system, including carburetor or fuel injection systems.
* **Engine Removal and Installation:** Find detailed instructions for removing and reinstalling the engine.
* **Cylinder Head, Cylinder, and Piston:** Gain in-depth knowledge of these crucial engine components.
* **Clutch and Gearshift Linkage:** Learn how to service and repair the clutch and gearshift system.
* **Crankshaft and Transmission:** Understand the workings of the crankshaft and transmission system.
* **Front Wheel, Suspension, and Steering:** Get comprehensive information on the front wheel, suspension, and steering system.
* **Rear Wheel and Suspension:** Learn about the rear wheel and suspension system.
* **Brakes:** Explore the braking system, including troubleshooting and repair.
* **Charging System and Alternator:** Understand how the charging system and alternator work.
* **Ignition System:** Explore the inner workings of the ignition system.
* **Electric Starter and Starter Clutch:** Learn about the operation and maintenance of the electric starter and starter clutch.
* **Lights, Meters, and Switches:** Gain insights into the lighting system, instrumentation, and switches.
* **Wiring Diagram:** A detailed wiring diagram helps you understand the electrical system.
* **Troubleshooting:** Find helpful tips for diagnosing and troubleshooting common problems.
* **Index:** A comprehensive index makes it easy to find specific information.

This repair manual empowers you to maintain and repair your motorcycle efficiently, saving you money and time.

The KTM 400-660 LC4, produced from 2003, represents a pivotal point in the Austrian motorcycle manufacturer's history. This series of single-cylinder, four-stroke motorcycles served as the foundation for KTM's foray into the burgeoning, high-performance off-road market. The LC4 engine, known for its compact design and robust performance, was a hallmark of these models. The 400cc and 660cc displacements provided a wide spectrum of power and torque, catering to diverse riding styles and terrain. The 400 LC4, with its nimble handling and responsive throttle, was ideal for tight trails and technical sections, while the 660 LC4 offered a more potent punch for tackling challenging terrain and long-distance adventures.

Beyond the engine, these motorcycles boasted a rugged, race-inspired chassis. A lightweight aluminum frame, coupled with high-quality suspension components from WP, ensured precise handling and a comfortable ride. The 400 and 660 LC4 models were available in various configurations, including Enduro, Supermoto, and Adventure versions, catering to a wide range of rider preferences. These motorcycles, equipped with high-performance brakes, durable components, and a user-friendly interface, became renowned for their reliability and versatility. The KTM 400-660 LC4 series established a legacy of robust and capable machines, paving the way for KTM's dominance in off-road motorcycle design and performance. These models, even today, are popular amongst riders who appreciate their combination of performance, maneuverability, and durability.