This manual covers the 450 SX ATV models from 2009 through 2011. Known for its powerful single-cylinder, liquid-cooled LC4 engine and aggressive chassis design, this performance-oriented ATV is built for competitive off-road riding and motocross. Building on a strong off-road racing heritage, the 450 SX ATV features high-quality suspension components, lightweight construction, and a focus on rider control and direct feedback, making it a formidable machine in its class. This comprehensive workshop repair service manual provides in-depth technical coverage for professional mechanical technicians and experienced DIY enthusiasts. It details essential maintenance procedures, including scheduled tasks, fluid changes, and component checks, alongside thorough troubleshooting guides for common issues. The manual also includes step-by-step repair instructions for all major systems, such as the engine, fuel system, transmission, electrical system, suspension, and brakes, as well as critical technical specifications, ensuring the optimal performance and longevity of your 450 SX ATV. 🏷️ Basic Information Identification Make: KTM Model: 450 SX ATV Model Years Covered: 2009, 2010, 2011 Product Type: Workshop Repair Service Manual Codes Engine Code General: LC4 450 👋 Introduction Market Position Positioning: Performance-oriented ATV for motocross and competitive off-road riding. Competitive Analysis Competitors: Yamaha YFZ450, Suzuki LT-R450, Honda TRX450R. Key Features Vehicle Attributes: Powerful single-cylinder engine, aggressive chassis design, high-quality suspension components, lightweight construction. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive mechanical and electrical service, repair, and maintenance procedures. Target Audience: Professional mechanical technicians, experienced DIY enthusiasts. Page Count Estimated Pages: 300-500 (typical for this class of manual, exact count not provided in product info) Manual Type Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, internal component diagnosis and repair, piston, rings, cylinder head, valves, camshaft, crankshaft, oil pump, cooling system. Fuel System: Carburetor (Keihin FCR-MX likely), fuel lines, fuel pump (if applicable), fuel tank maintenance and repair. Transmission Drivetrain: Clutch system, gearbox inspection and repair, shifting mechanism, final drive (chain and sprockets). Electrical System: Ignition system, starter motor, battery, charging system (stator, regulator/rectifier), lighting, wiring diagrams, troubleshooting. Suspension: Front fork (WP Suspension likely) disassembly, assembly, seal replacement, oil changes, adjustment; rear shock absorber service and adjustment. Brakes: Hydraulic brake system (front and rear calipers, master cylinders), brake pad replacement, fluid bleeding, rotor inspection and service. Chassis Frame: Frame inspection, subframe, steering head bearings, wheel bearings, swingarm, linkage system. Bodywork Trim: Removal and installation of plastics, seat, handlebars, footpegs. Procedures Included Maintenance: Scheduled maintenance tasks, oil and filter changes, air filter cleaning/replacement, spark plug service, chain adjustment, valve clearance checks. Troubleshooting: Diagnostic charts, common problems and solutions, fault finding procedures. Repair: Detailed step-by-step instructions for component disassembly, inspection, repair, and reassembly. Technical Specifications: Torque values, clearances, fluid capacities, electrical specifications, diagnostic parameters. Technical Depth Depth: In-depth technical coverage, suitable for complete engine rebuilds, complex electrical diagnostics, and suspension overhauls. 📊 Manual Specifications File Format Format Details: Digital PDF; typically searchable text and high-resolution images/diagrams. Print Quality Quality: High-resolution scans or original digital files, ensuring clarity of text and diagrams. Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Type: Single-cylinder, 4-stroke, Liquid-cooled (LC4) Displacement: 449.4 cc Bore X Stroke: 95 mm x 63.4 mm Compression Ratio: 12.3:1 Valve Train: SOHC, 4 valves Performance Horsepower Est: Approx. 45-50 HP (varies by tuning and specific model year) Torque Est: Approx. 40-45 Nm (varies) Fuel System Carburetor: Keihin FCR-MX 39mm Fuel Type: Unleaded Gasoline (95 RON recommended) Cooling System Type: Liquid-cooled Oil System Oil Type Recommended: JASO MA certified 10W-40 or 10W-50 Synthetic Motorcycle Oil Oil Capacity Est: Approx. 1.6 - 1.8 Liters (with filter change) 🔧 Transmission Standard Type: 5-speed manual gearbox with reverse Clutch: Wet multi-plate clutch Features Gear Ratios: Detailed in manual, specific ratios vary by year/trim. Final Drive: O-ring sealed chain Oil Type Recommended Transmission Oil: Gear oil, specific viscosity (e.g., SAE 75W-90 or 80W-90) as per manual. 📐 Dimensions Exterior Wheelbase Approx: Approx. 1280 mm Ground Clearance Approx: Approx. 200-250 mm Weights Dry Weight Approx: Approx. 180-190 kg Fuel Tank Capacity: Approx. 9 Liters 🛡️ Safety Features Ratings Safety Certification: N/A (ATV specific safety standards apply, not typical automotive crash ratings). Active Features Braking System: Hydraulic disc brakes front and rear, performance-oriented. Suspension Design: Independent front suspension, swingarm rear suspension for stability and control. Passive Features Handlebars: Fat bar handlebars for improved control and impact absorption. 💡 Technology Features Infotainment Features: Minimalistic for performance focus; typically basic digital display for engine hours, odometer, speed. Driver Assistance Features: None (Focus on rider control and direct feedback). Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change: Every 15-20 operating hours or annually, per manual recommendations. Air Filter Cleaning: After every few rides or as conditions dictate, critical for performance. Valve Clearance Check: Typically every 50-100 operating hours, crucial...