Model:
400 SX, 450 SX, 400 MXC, 450 MXC, 400 XC, 450 XC
Model Variants:
SX (Motocross), MXC (Cross Country), XC (Cross Country/Enduro)
Generation Identifier:
2000-2007 Models
Chassis Codes:
Likely varied by specific year and model variant, common codes can be found within the manual.
Engine Codes:
LC4 engine family (various displacements within 400-450cc range)
Market Segment:
High-performance off-road motorcycles (Motocross, Cross Country, Enduro).
Competitors:
Yamaha YZ/WR series, Honda CR/XR series, Suzuki RM/DR series, Kawasaki KX/KDX series, Husqvarna, Beta.
Vehicle Strengths:
Powerful LC4 engines, robust chassis, excellent suspension performance, aggressive styling, capable for demanding off-road competition.
Target Audience:
KTM owners, aspiring mechanics, off-road enthusiasts looking for in-depth knowledge to maintain and repair their motorcycles.
Engine:
Complete engine assembly, disassembly, overhaul, tuning, lubrication, cooling system, exhaust system, fuel system, ignition system, starting system.
Transmission:
Gearbox disassembly, assembly, inspection, lubrication, clutch operation and maintenance, shifting mechanisms.
Chassis And Suspension:
Frame inspection, fork disassembly and rebuild, rear shock absorber servicing, swingarm, linkage, wheel bearings, steering head bearings.
Brakes:
Hydraulic brake system diagnosis, caliper servicing, master cylinder overhaul, bleeding procedures, brake pad replacement, rotor inspection.
Electrical System:
Wiring diagrams, lighting system, ignition coils, battery maintenance, stator and rotor testing, starter motor, fuses, switches, sensors.
Fuel System:
Carburetor (likely Mikuni or Keihin) disassembly, cleaning, tuning, jetting, fuel pump (if applicable), fuel tank, fuel lines.
Bodywork And Ergonomics:
Fairings, seat, handlebars, controls, footpegs, fender replacement, graphics/plastics.
Maintenance:
Routine checks, oil changes, filter replacements, chain adjustment, spark plug replacement, valve clearance adjustment, brake fluid changes, coolant checks.
Troubleshooting:
Diagnostic charts for common problems, symptoms, and solutions for engine, electrical, and chassis issues.
Repair And Rebuild:
Detailed step-by-step instructions for component disassembly, inspection, repair, and reassembly of all major vehicle systems.
Technical Specifications:
Torque values, tolerances, fluid capacities, electrical specifications, diagnostic data.
Depth:
Comprehensive, covering everything from basic pre-ride checks to full engine and transmission rebuilds. Suitable for professional mechanics and advanced DIY enthusiasts.
Engine Family:
KTM LC4 Single-cylinder, four-stroke
Displacement Options:
Approximately 400cc and 450cc (specific bore/stroke variations within the model range)
Cooling System:
Liquid-cooled
Valve Train:
SOHC (Single Overhead Camshaft), 4 valves
Horsepower Range:
Estimated 45-55+ hp (depending on specific model and tuning, precise figures in manual)
Torque Range:
Estimated 35-45+ lb-ft (depending on specific model and tuning, precise figures in manual)
Carburetor Type:
Mikuni (e.g., TM40, TM42) or Keihin FCR (specific model dependent, detailed in manual)
Fuel Type:
Unleaded gasoline (91-98 octane RON recommended)
Ignition Type:
Electronic ignition (CDI/Digital)
Infotainment System:
N/A (Dedicated off-road competition machines, no infotainment features).
Driver Assistance Features:
N/A (Focus is on rider control and mechanical systems).
Connectivity Options:
N/A
Engine Management System:
Basic CDI ignition system and carburetor for fuel delivery.
Oil Change Interval:
Every 10-20 hours of riding or annually, whichever comes first (specific recommendations in manual).
Air Filter Cleaning:
After every few rides or as needed based on riding conditions (detailed in manual).
Valve Clearance Check:
Typically every 40-60 hours of riding (critical maintenance item, detailed in manual).
Chain And Sprockets:
Regular cleaning, lubrication, and tension adjustment; replacement based on wear.
Engine Oil Type:
High-quality motorcycle-specific 4-stroke engine oil, typically SAE 10W-40 or 15W-50, meeting JASO MA standards (check manual for exact specification).
Coolant Type:
Mixture of distilled water and ethylene glycol-based antifreeze (specific ratio and type in manual).
Brake Fluid Type:
DOT 4 hydraulic brake fluid (check manual for confirmation).
Common Wear Items:
Clutch wear, valve seat wear, fork seal leaks, swingarm/linkage bearings, wheel bearings, cam chain tensioner (depending on year).
Carburetor Tuning:
Can be sensitive to altitude and temperature changes, requiring periodic jetting adjustments.
Cooling System Maintenance:
Regular coolant flushes and inspection of hoses for leaks are important to prevent overheating.
Brand Focus:
KTM is renowned for its off-road racing heritage and 'Ready to Race' philosophy, specializing in dirt bikes, ATVs, and adventure motorcycles.
Lc4 Lineage:
The LC4 engine platform has a long and storied history within KTM, evolving from earlier models to become a dominant force in various off-road disciplines.
Sx Mxc Xc Differentiation:
SX models are pure motocross race bikes, MXC and XC models are tailored for cross-country and endurance racing with features like larger fuel tanks, lighting, and often slightly different suspension/engine tuning.
Production Period:
2000-2007
