🏷️ Basic Information Identification Make: KTM Model: 660 SMC LC4 Year: 2003 Codes Engine Code Family: LC4 Engine Displacement Variants: 400cc, 600cc, 620cc, 625cc, 640cc, 660cc 👋 Introduction Market Position Product Category: Specialized Motorcycle Service Manual Target Audience: KTM LC4 motorcycle owners, independent repair shops, motorcycle technicians. Competitive Analysis Value Proposition: Provides essential technical information for DIY maintenance and repair, saving on professional labor costs and extending motorcycle lifespan. Key Features Download Access: Instant download post-purchase, eliminating shipping delays and costs. Comprehensiveness: Covers a wide range of LC4 engine variants and associated systems. 📋 Manual Details Coverage Areas Manual Coverage: Engine Service, Workshop Repair Page Count Page Count: Likely extensive, typical for a full workshop manual covering multiple engine displacements within the LC4 family. Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine disassembly, assembly, inspection, and repair of all internal components (crankshaft, connecting rod, piston, cylinder, valves, camshaft, oil pump, etc.). Cooling System: Radiator, hoses, thermostat, coolant type and capacity. Lubrication System: Oil pump operation, oil filter replacement, oil change intervals, oil type and capacity. Fuel System: Carburetor (Keihin CV/K-series variations for different displacements), fuel tank, fuel lines, fuel filter, fuel pump (if applicable for specific models/years). Ignition System: Ignition coil, spark plug, CDI unit, timing. Electrical System: Wiring diagrams, starter motor, charging system (stator, regulator/rectifier), battery specifications. Procedures Included Engine Removal Refitting: Detailed steps for removing the engine from the motorcycle chassis and reinstalling it. Engine Disassembly: Step-by-step breakdown of the engine into its constituent parts. Engine Assembly: Step-by-step reassembly of the engine with torque specifications. Component Servicing: Detailed procedures for servicing individual engine components like cylinder head, valve train, transmission components (if integrated), clutch. Troubleshooting: Diagnostic guides for common problems, symptom analysis, and corrective actions. Maintenance Tasks: Regular service tasks such as oil changes, filter replacements, spark plug checks, valve adjustments. Technical Depth Depth Level: Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts. Covers full engine rebuilds. Diagnostic Capabilities: Includes troubleshooting sections for identifying and resolving mechanical and electrical issues. Diagrams Illustrations: Features detailed exploded views and diagrams for clear identification of parts and assembly sequences. 📊 Manual Specifications File Format Digital Format: PDF (Portable Document Format) Print Quality Printability: Fully printable, allowing users to print specific sections or the entire manual for workshop use. Binding Type Binding Type: N/A (Digital format; if printed, would typically be spiral-bound for ease of use). Paper Type Paper Type: N/A (Digital format; if printed, high-quality, durable paper recommended for workshop environments). ⚙️ Engine Specifications Primary Engine Engine Type: Single-cylinder, 4-stroke, Liquid-cooled (for most variants), SOHC (Single Overhead Camshaft), often with decompression mechanism. Engine Family: LC4 (Liquid-cooled, 4 valves, Camshaft) Bore X Stroke Variants: Varies by displacement (e.g., 400cc: ~84x72mm, 640cc: ~101x78mm, 660cc: ~102x80mm - exact figures depend on specific variant). Compression Ratio Variants: Typically ranges from 10.5:1 to 12.0:1 depending on the specific engine variant and tuning. Performance Horsepower Estimated Range: Approximately 30-55 HP, depending on displacement, state of tune, and emissions regulations for the specific model year and market. Torque Estimated Range: Approximately 30-50 Nm, depending on displacement and engine configuration. Fuel System Carburetor Type Common: Keihin CV (Constant Velocity) or Pumper carburetors, typically 36mm to 41mm depending on the engine size and model variant. Fuel Grade Recommendation: Unleaded gasoline with an octane rating of 91 (RON + MON)/2 or higher. Specific recommendation per model should be verified in the manual. 🔧 Transmission Standard Transmission Type: 5-speed or 6-speed constant mesh manual transmission. Optional Transmission Variants: Some earlier models or specific variants might have had different gear ratios or configurations. The manual should detail these. Features Clutch Type: Wet multi-plate clutch, hydraulically operated. 📐 Dimensions Exterior Vehicle Type: Dual-Sport/Enduro, Supermoto, Adventure Motorcycle (depending on specific model variant). Weights Dry Weight Estimated: Approximately 130-155 kg (dry), depending heavily on the specific model (e.g., EXC vs. Duke vs. Adventure). 🛡️ Safety Features Ratings Safety Certification: N/A (Motorcycles typically do not have the same crash test rating systems as cars). Active Features Braking System Front: Hydraulic disc brake, typically Brembo, with single or dual piston calipers depending on model. Braking System Rear: Hydraulic disc brake, typically Brembo, with single piston caliper. Passive Features Lighting System: Halogen headlight, taillight, turn signals. 💡 Technology Features Infotainment Instrumentation: Analog tachometer and speedometer, odometer, trip meters, indicator lights (neutral, oil pressure, turn signals, high beam). Driver Assistance Traction Control: Not typically equipped on 2003 LC4 models. Connectivity Usb Charging: Not standard equipment on 2003 LC4 models. Aftermarket solutions are common. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000 - 5,000 km or annually, depending on usage. Consult manual for specific model year recommendations. Air Filter Cleaning: Recommended every 3,000 - 5,000 km or more frequently in dusty...