Model:
        
        
            SX-EXC Series (2-stroke and 4-stroke variants)
        
     
    
        
            Covered Years:
        
        
            2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
        
     
    
        
            Engine Displacements Covered:
        
        
            250cc, 400cc, 450cc, 525cc
        
     
    
        
            Model Variants Covered:
        
        
            SX (Motocross), EXC (Enduro)
        
     
    
    
        
            Engine Codes:
        
        
            Varies by specific model and year (e.g., LC4 for larger displacements)
        
     
 
    
    
    
        
            Segment:
        
        
            High-performance off-road motorcycles (Motocross and Enduro)
        
     
    
        
            Target User:
        
        
            Enthusiast owners, amateur and professional racers, independent repair shops, KTM service centers.
        
     
    
    
        
            Competitors:
        
        
            Yamaha YZ/WR series, Honda CR/CRF series, Suzuki RM/DRZ series, Kawasaki KX/KLX series.
        
     
    
        
            Key Differentiators:
        
        
            KTM's reputation for powerful engines (especially the LC4 lineage), advanced chassis design, and racing pedigree.
        
     
    
    
        
            Manual Value:
        
        
            Provides the essential technical knowledge to maintain, diagnose, and repair these high-performance machines effectively, saving time and money on professional servicing.
        
     
    
        
            Vehicle Appeal:
        
        
            Known for their aggressive styling, potent engines, and exceptional handling capabilities in their respective classes.
        
     
 
    
    
    
        
            Primary Coverage:
        
        
            Complete Workshop Service and Repair
        
     
    
        
            Geographic Relevance:
        
        
            Global (with specific regional differences noted where applicable for parts/fluids)
        
     
    
    
        
            Estimated Page Count:
        
        
            High (Likely 500+ pages, comprehensive coverage)
        
     
    
    
        
            Type:
        
        
            Workshop Service Repair Manual
        
     
    
    
    
    
        
            Format:
        
        
            Downloadable Digital File (likely PDF)
        
     
 
    
    
    
        
            Engine:
        
        
            Top-end (cylinder, piston, valves), bottom-end (crankshaft, connecting rod, bearings), lubrication system, cooling system (liquid-cooled variants), fuel system (carburetor/injection), ignition system, exhaust system
        
     
    
        
            Transmission:
        
        
            Clutch, gearbox (gear selection, ratios), final drive (chain and sprockets)
        
     
    
        
            Chassis:
        
        
            Frame inspection and repair, suspension (forks, rear shock absorber, linkage), steering system, wheels, hubs, spokes, braking system (hydraulic front and rear), controls (levers, cables)
        
     
    
        
            Electrical:
        
        
            Wiring diagrams, lighting system, ignition system, battery, charging system (alternator/stator), starter system (electric start variants), instrumentation, sensors
        
     
    
        
            Bodywork:
        
        
            Body panels, seat, fuel tank, fenders, graphics, ergonomics
        
     
    
    
        
            Maintenance:
        
        
            Scheduled maintenance checks, oil changes, filter replacements, chain adjustment, spark plug replacement, valve clearance adjustment (if applicable), brake pad replacement, fluid flushes
        
     
    
        
            Troubleshooting:
        
        
            Diagnostic procedures for common issues, fault finding, symptom-based troubleshooting guides
        
     
    
        
            Repair:
        
        
            Component disassembly, inspection, repair, and reassembly for all major systems. Engine rebuild procedures, transmission overhaul, suspension servicing, brake caliper rebuild.
        
     
    
        
            Installation:
        
        
            Instructions for installation of common aftermarket or OEM replacement parts.
        
     
    
    
        
            Depth:
        
        
            Comprehensive. Covers basic adjustments to full engine and transmission rebuilds. Includes torque specifications, clearances, and detailed step-by-step instructions with diagrams.
        
     
 
    
    
    
        
            Type:
        
        
            Four-stroke, single-cylinder, liquid-cooled (common for EXC variants and later SX models in this range); some early models or specific variants might be two-stroke.
        
     
    
        
            Bore X Stroke:
        
        
            Varies significantly by displacement (e.g., 450 SX-F would differ from 250 SX-F).
        
     
    
        
            Valve Train:
        
        
            DOHC, 4 valves (typical for 4-stroke models)
        
     
    
    
        
            Horsepower:
        
        
            Generous power output for displacement, typically ranging from 45-60+ HP depending on model and tuning.
        
     
    
        
            Torque:
        
        
            Strong mid-range and top-end torque delivery, characteristic of KTM off-road engines.
        
     
    
    
        
            Carburetor Spec:
        
        
            Keihin flat-slide carburetors (e.g., PWK series) common in early models; Mikuni also used.
        
     
    
        
            Fuel Injection Spec:
        
        
            Keihin or Delphi electronic fuel injection (EFI) introduced on some later models within this range.
        
     
    
    
        
            Type:
        
        
            Pressurized liquid cooling system with electric fan on some models.
        
     
 
    
    
    
        
            Type:
        
        
            Constant mesh, sequential 5 or 6-speed gearbox.
        
     
    
    
        
            Configurations:
        
        
            N/A (Standardized for model type)
        
     
    
    
        
            Clutch Type:
        
        
            Hydraulic multi-plate wet clutch.
        
     
    
        
            Final Drive:
        
        
            O-ring sealed chain drive.
        
     
 
    
    
    
        
            Seat Height:
        
        
            High, typical for off-road competition bikes (e.g., 37-39 inches).
        
     
    
        
            Ground Clearance:
        
        
            Generous, designed for off-road obstacles.
        
     
    
    
        
            Dry Weight:
        
        
            Generally lightweight, aiming for optimal power-to-weight ratio (e.g., 220-250 lbs).
        
     
    
        
            Fuel Tank Capacity:
        
        
            Typically around 2-3 gallons.
        
     
 
    
    
    
        
            Crash Test Ratings:
        
        
            N/A (Motorcycles are not subject to standardized crash test ratings like cars).
        
     
    
    
        
            Braking System:
        
        
            High-performance hydraulic disc brakes front and rear, often with Brembo components.
        
     
    
        
            Suspension Handling:
        
        
            Advanced suspension systems (WP Suspension) contribute to stability and control.
        
     
    
    
        
            Chassis Design:
        
        
            Chromoly steel frame provides strength and rider feedback.
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Typically every 10-20 hours of riding for competition use, or as specified in the manual. Owner's manual might suggest longer for casual use.
        
     
    
        
            Air Filter Cleaning:
        
        
            Frequent cleaning required, often before or after every ride depending on conditions.
        
     
    
        
            Spark Plug Replacement:
        
        
            As per manual recommendations, typically based on hours or specific mileage.
        
     
    
    
        
            Engine Oil:
        
        
            High-quality synthetic motorcycle oil, typically 10W-40 or 10W-50, meeting specific JASO standards (e.g., MA/MA2).
        
     
    
        
            Coolant:
        
        
            Ethylene glycol-based coolant with corrosion inhibitors, typically a 50/50 mix with distilled water.
        
     
    
        
            Brake Fluid:
        
        
            DOT 4 or DOT 5.1 high-temperature hydraulic brake fluid.
        
     
    
        
            Clutch Fluid:
        
        
            Typically Mineral Oil (for Magura hydraulic clutches common on KTMs) or DOT 4 brake fluid depending on the specific master cylinder.
        
     
    
    
        
            Common Wear Items:
        
        
            Clutch plates, piston rings, valve stem seals, wheel bearings, steering head bearings, swingarm bearings, fork seals.
        
     
    
        
            Potential Problems:
        
        
            Overheating on older models with undersized radiators, occasional carburetor jetting issues, cam chain tensioner wear on some 4-stroke engines.
        
     
    
    
        
            Pre Ride Checks:
        
        
            Tire pressure, chain tension, fluid levels, brake operation, bolt tightness.
        
     
 
    
    
    
        
            Origin:
        
        
            Austrian manufacturer with a strong legacy in off-road and racing disciplines.
        
     
    
        
            Racing Success:
        
        
            Extensive history of victories in Motocross Grand Prix, Enduro World Championships, and Dakar Rally.
        
     
    
    
        
            Development Focus:
        
        
            Continuous refinement of engine performance, suspension, chassis dynamics, and weight reduction.
        
     
    
        
            Technology Adoption:
        
        
            Transition from carbureted to fuel-injected engines, updates in suspension technology, and frame design advancements within this generation.
        
     
    
    
        
            Manufacturing Location:
        
        
            Primarily Austria, with potential for some components or assembly in other regions.
        
     
    
        
            Key Production Years:
        
        
            The manual covers a specific, well-defined generation of these models, representing a significant era of KTM's off-road development.
        
     
 
    
    
    
        
            Motocross Titles:
        
        
            KTM SX models have numerous national and international motocross championships across various classes.
        
     
    
        
            Enduro Titles:
        
        
            KTM EXC models are highly decorated in enduro racing, including multiple ISDE wins and world championships.
        
     
    
    
        
            Editorial Reviews:
        
        
            Consistently receive high praise from motorcycle publications for performance, handling, and durability in demanding off-road conditions.
        
     
    
    
        
            Emission Standards:
        
        
            Compliant with relevant emission standards for their model years and intended markets (may vary).