Years Covered:
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Engine Code Common:
LC4 (specific variations may exist per year)
Category:
Competition Off-Road Motorcycle (Motocross/Enduro)
Purpose:
High-performance off-road riding, racing, and recreational use
Competitors Circa 2000S:
Yamaha YZ450F, Honda CRF450R, Suzuki RM-Z450, Kawasaki KX450F
Engine Architecture:
Powerful single-cylinder, liquid-cooled, 4-stroke LC4 engine
Suspension Type:
High-quality WP suspension components (front forks, rear shock)
Chassis Design:
Chromium-molybdenum steel trellis frame for rigidity and light weight
Braking System:
Performance-oriented Brembo disc brakes front and rear
Engine Mechanical:
Full engine overhaul, assembly, disassembly, component testing, torque specifications
Fuel System:
Carburetor (Mikuni, Keihin variants typical), fuel pump, fuel lines, tank maintenance
Ignition System:
Ignition timing, coil testing, CDI unit diagnostics, spark plug selection
Cooling System:
Radiator, coolant, fan operation, hose inspection and replacement
Transmission:
Gearbox disassembly, assembly, clutch operation, gear shift mechanism
Suspension Front:
Fork disassembly, oil change, seal replacement, compression/rebound adjustments
Suspension Rear:
Shock absorber overhaul, linkage service, bearing inspection
Brakes Front:
Caliper service, master cylinder overhaul, pad replacement, bleeding procedures
Brakes Rear:
Caliper service, master cylinder overhaul, pad replacement, bleeding procedures
Electrical System:
Wiring diagrams, lighting, battery maintenance, stator/regulator testing
Frame And Bodywork:
Chassis inspection, subframe, body panel removal and installation
Wheels And Tires:
Spoke tensioning, wheel bearing replacement, tire pressure recommendations
Controls:
Throttle, clutch lever, brake lever, footpeg adjustment and service
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, air filter cleaning
Troubleshooting:
Diagnostic charts, symptom-based issue resolution
Repair Procedures:
Step-by-step instructions for all major components and systems
Rebuild Instructions:
Detailed guides for engine and transmission rebuilds
Torque Specifications:
Comprehensive list of all critical torque values
Special Tools:
Identification and usage of KTM-specific or recommended tools
Depth:
Comprehensive from basic checks to full engine and chassis rebuilds
Engine Type:
Liquid-cooled, 4-stroke, SOHC, single-cylinder (LC4 architecture)
Displacement Cc:
Approximately 400-450cc (specific variants exist across the model years)
Bore X Stroke:
Typically around 95mm x 63.4mm (subject to variation)
Compression Ratio:
Generally around 11.0:1 to 12.0:1
Valve Train:
SOHC, 4 valves
Cooling Method:
Liquid Cooling
Estimated Horsepower:
Around 45-55 HP (at crank, varies by year and specific tuning)
Estimated Torque:
Around 40-45 Nm (at crank, varies by year and specific tuning)
Carburetor Type:
Mikuni VM40SS or similar (e.g., Keihin FCR 39/41)
Fuel Type Recommendation:
Unleaded Gasoline (Octane rating typically 95 RON or higher)
Fuel Capacity Liters:
Approximately 9-11 Liters
Frame Material:
Chromium-molybdenum steel, trellis type
Front Suspension Type:
WP USD (Upside-Down) telescopic forks
Rear Suspension Type:
WP PDS (Progressive Damping System) monoshock
Front Brake Type:
Hydraulic disc brake, Brembo caliper
Rear Brake Type:
Hydraulic disc brake, Brembo caliper
Dry Weight Kg:
Approximately 110-120 kg (varies by year and specific equipment)
Wet Weight Kg:
Approximately 120-130 kg (with fluids)
Wheelbase Mm:
Approximately 1450-1470 mm (varies slightly by year)
Seat Height Mm:
Approximately 950-970 mm (varies)
Infotainment System:
N/A (Pure competition off-road motorcycle, no infotainment features)
Driver Assistance Features:
N/A (Pure competition off-road motorcycle, no electronic rider aids)
Connectivity Options:
N/A (Pure competition off-road motorcycle, no connectivity features)
Engine Oil Change:
Typically every 10-15 engine hours or every 2000-3000 km, consult manual for specifics.
Air Filter Cleaning:
Recommended after every few rides or in dusty conditions.
Spark Plug Replacement:
Check and clean at regular intervals, replace as needed based on condition (e.g., every 30-50 hours).
Chain Lubrication Adjustment:
Check and lubricate before every ride, adjust tension as needed.
Engine Oil Type:
SAE 10W-40 or 10W-50, API SG or higher (specific KTM recommendations preferred).
Engine Oil Capacity Liters:
Approximately 1.1 - 1.3 Liters (check dipstick/sight glass).
Coolant Type:
Ethylene glycol-based coolant, 50% mixture with distilled water.
Fork Oil Type And Viscosity:
Typically SAE 5W or 7.5W (check manual for exact spec and level).
Common Wear Items:
Clutch plates, piston rings, valve guides, wheel bearings, fork seals.
Typical Faults:
Carburetor jetting issues, starter motor reliability (early models), kickstart mechanism wear.
Ktm Offroad Legacy:
KTM has a long and successful history in off-road racing, particularly in motocross and enduro.
Lc4 Platform:
The LC4 engine platform was a staple for KTM in the late 90s and early 2000s, known for its torque and durability.
Mxc Designation:
The 'MXC' designation typically denoted a more competition-oriented, sometimes homologated for street-legality in certain regions, version of their motocross/enduro bikes.
Manufacturing Origin:
Austria
