**KTM LC4 400-660: A Comprehensive Overview**

**Introduction**

The KTM LC4 400-660 is a legendary dual-sport motorcycle that has earned a reputation for its exceptional reliability, off-road prowess, and undeniable street cred. Introduced in 1987, the LC4 has undergone several evolutions, with the 400-660 models representing a pivotal period in its illustrious history.

**Engine and Transmission**

At the heart of the LC4 lies a compact and potent single-cylinder engine. Displacing 398cc or 625cc, the liquid-cooled Rotax powerplant delivers impressive power and torque throughout the rev range. The engine is meticulously engineered with a dual-overhead-camshaft (DOHC) configuration, four-valve cylinder head, and a counterbalancer to minimize vibrations.

The LC4's transmission is a robust five-speed unit that provides precise and smooth shifting. The wide gear ratios cater to a range of riding conditions, from technical trails to open highways. A hydraulically actuated wet clutch offers a light and progressive feel for effortless operation.

**Chassis and Suspension**

The LC4's lightweight and agile chassis is a testament to KTM's championship-winning heritage. The chromoly steel frame combines strength with a low center of gravity for exceptional handling and stability. The WP suspension system features fully adjustable front and rear setups, allowing riders to fine-tune the bike's handling characteristics to suit their riding style and terrain.

The front suspension consists of a 48mm upside-down fork with 295mm of travel. The progressive valving provides a plush and responsive ride, absorbing the harshest of bumps while maintaining composure at high speeds.

At the rear, a WP monoshock with linkage provides 305mm of travel. The shock's adjustable preload and rebound damping allow riders to optimize the suspension for varying loads and terrain conditions.

**Brakes and Wheels**

Stopping power is exceptional, courtesy of Brembo brakes. The dual front discs are 300mm in diameter and are paired with four-piston calipers, providing both feel and stopping power. The single 240mm rear disc is equally capable, ensuring controlled and responsive braking in all conditions.

The LC4 rolls on sturdy 21-inch front and 18-inch rear spoked wheels. The combination of off-road-worthy tires and ample ground clearance makes the LC4 a formidable adversary in any environment.

**Ergonomics and Comfort**

The KTM LC4 400-660 offers a comfortable and upright riding position, optimized for long days in the saddle. The wide and sculpted handlebars provide excellent leverage, while the rider's triangle is carefully designed to reduce fatigue. The adjustable seat height accommodates riders of varying heights.

**Verdict**

The KTM LC4 400-660 is a true embodiment of KTM's "Ready to Race" ethos. Its blend of raw power, unshakeable reliability, and versatile handling make it a perfect companion for spirited rides on both the asphalt and the dirt. Whether you're a seasoned rider or just starting your adventure-riding journey, the LC4 is an exceptional choice that will deliver thrills and memories for years to come.

KTM Engine 400-660LC4 2003 Service manual is a professional book in which you can get a better understanding of KTM Engine 400-660LC4 2003. This Service Manual contains comprehensive instructions and procedures of high quality on how to fix the problems in your car, which can save you a lot of time and help you to decide the best with ease.

Manuals Includes info on:
Servicing information
General information
Removing and refitting engine
Disassembling the engine
Servicing individual components
Assembling the engine
Electrical
Fuel system
Troubleshooting
Technical specifications
Periodic maintenance schedule
Wiring diagrams






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