🏷️ Basic Information Identification Make: KTM Model: 400-660 LC4 Year Range: 1998-2003 Engine Family: LC4 Vehicle Type: Dual-Sport / Adventure Motorcycle 👋 Introduction Market Position Market Position: The KTM LC4 series from this era represented a robust and potent offering in the dual-sport and adventure motorcycle segment, known for their strong single-cylinder engines and off-road prowess. This manual targets owners and technicians seeking in-depth knowledge for maintenance and repair. Competitive Analysis Competitive Analysis: Competed with models like the BMW GS series (smaller displacements), Honda XR/Transalp, Yamaha XT/Ténéré, and Suzuki DR-Z. The LC4's advantage often lay in its raw power and ruggedness, appealing to riders prioritizing performance and off-road capability. Key Features Key Features: Detailed exploded diagrams, step-by-step instructions, troubleshooting guides, technical specifications, electrical diagrams. Enables significant cost savings on professional servicing and empowers users for long-term ownership. 📋 Manual Details Coverage Coverage Areas: Engine, Transmission, Chassis, Electrical System, Bodywork, Suspension, Brakes, Fuel System, Cooling System, Exhaust System, Troubleshooting, Periodic Maintenance Format Manual Type: Service Repair Manual / Workshop Manual Language: English (Assumed, standard for technical manuals) Format: Digital Download (Printable) Completeness Page Count: N/A (Digital product, often variable based on digital version) Accessibility Download Method: Instant download after purchase. Value Proposition Cost Savings: Enables DIY maintenance and repairs, significantly reducing labor costs associated with professional servicing. Content Enhancements Diagrams Illustrations: Contains highly detailed exploded pictures and diagrams to aid in component identification and assembly. 📖 Manual Coverage Systems Systems Covered: Engine (LC4 single-cylinder, including top-end, bottom-end, lubrication, cooling), Fuel System (Carburetor types common for the era - e.g., Keihin, Mikuni), Ignition System, Electrical System (Wiring diagrams, components, troubleshooting), Drivetrain (Clutch, gearbox, final drive), Suspension (Front forks, rear shock absorber), Braking System (Front and rear), Chassis components, Frame, Body panels, Wheels and Tires Procedures Procedures Included: Disassembly, Reassembly, Inspection, Adjustment, Diagnosis, Troubleshooting, Routine Maintenance, Component Replacement, Lubrication Procedures, Torque Specifications Depth Technical Depth: Comprehensive workshop level. Includes detailed exploded views, diagrams, step-by-step instructions for internal engine work, electrical diagnostics, and chassis repairs. Suitable for experienced DIY mechanics and professional workshops. Specific Procedures Carburetor Rebuild: Detailed instructions for disassembly, cleaning, reassembly, and jetting adjustments for common carburetor models used. Suspension Servicing: Procedures for fork seal replacement, oil changes, and rear shock absorber maintenance. Includes recommended oil levels and types. Electrical Troubleshooting: Systematic troubleshooting steps for ignition, lighting, starting, and charging systems using provided wiring diagrams. Technical Depth Torque Specifications: Comprehensive torque values for all critical fasteners and components. Diagnostic Procedures: Step-by-step diagnostic trees for common problems and symptoms. Special Tools: May list specific tools required for certain procedures, such as clutch holding tools, valve spring compressors, or torque wrenches calibrated to specific ranges. Bodywork Bodywork Procedures: Includes instructions for removing and refitting fuel tank, seat, side panels, fenders, and fairings (if applicable). 📊 Manual Specifications File Characteristics File Format: PDF (implied by 'downloadable' and 'printable') Print Quality: High resolution, suitable for printing individual pages or the entire manual. Diagrams and images are expected to be clear. Format Binding Type: N/A (Digital Product) Paper Type: N/A (Digital Product) ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, four-stroke, single-cylinder (LC4) Displacement Variants Engine Displacements: Approximately 398cc (400), 576cc (570/580), 625cc (620/625), and 647cc (640/660) depending on specific sub-model within the LC4 range. Performance Horsepower Range: Typically 45-55 HP, varying by specific displacement and tuning. Torque Range: Approximately 40-48 lb-ft, varying by specific displacement. Fuel System Fuel System: Carburetor (e.g., Keihin CVK, Mikuni BST series often utilized) Lubrication Lubrication System: Dry sump lubrication system (common for LC4) Valve Train Valve Train: SOHC, 4 valves Engine Code Examples Engine Code Examples: LC4 400, LC4 600, LC4 620, LC4 625, LC4 640, LC4 660 (specific sub-model designations can be found in the manual) Bore X Stroke Bore X Stroke: Varies by displacement; for example, 625cc models might be around 95mm x 89.5mm. The manual will provide exact figures for each variant. Compression Ratio Compression Ratio: Typically in the range of 10.5:1 to 12.0:1, depending on the specific model. Manual will confirm. Cooling System Cooling System: Liquid-cooled 🔧 Transmission Gearbox Transmission Type: 5-speed or 6-speed manual gearbox (depending on model variant) Clutch Clutch Type: Wet multi-plate clutch Final Drive Final Drive: Chain drive 📐 Dimensions Exterior Seat Height: Variable by model, typically 35-37 inches (890-940 mm) Weights Dry Weight: Approximately 300-340 lbs (136-155 kg), varies by model and equipment. Wheelbase Wheelbase: Varies by model, typically between 1450mm to 1500mm (approx. 57-59 inches). 🛡️ Safety Features Active Features Braking System: Hydraulic disc brakes front and rear. Passive Features Chassis Design: Steel frame, designed for durability and off-road use. 💡 Technology Features Infotainment Infotainment System: Minimal. Primarily basic analog instrumentation (speedometer, tachometer, odometer, indicator lights). Driver Assistance Driver Assistance: N/A (Typical for this era and category of motorcycle) 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000-5,000 km (approx....