🏷️ Basic Information

Make:

KTM

Model:

400 SX, 400 MXC, 400 EXC, 520 SX, 520 MXC, 520 EXC

Year:

2001

Engine Codes:

400 LC4, 520 LC4 (Specific codes would be in the manual)

👋 Introduction

Market Segment:

High-performance off-road motorcycles (Motocross and Enduro/Cross-Country variants).

Competitors:

Yamaha YZ series, Honda CR series, Suzuki RM series, Kawasaki KX series, Husqvarna (older models).

Performance Focus:

Designed for competition and aggressive off-road riding, prioritizing power and handling.

Model Diversity:

SX (Motocross), MXC (Cross-Country), EXC (Enduro/Trail) offer distinct gearing, suspension, and features for their intended disciplines.

📋 Manual Details

Covered Models:

KTM 400 SX, 400 MXC, 400 EXC, 520 SX, 520 MXC, 520 EXC

Covered Years:

2001

Page Count:

46

Manual Type:

Owner's Manual

Language:

English (Presumed based on product description)

Format:

Printed (Implied by typical sales of manuals)

📖 Manual Coverage

Engine:

Operation, basic maintenance, lubrication, cooling system, fuel system (carburetor details, fuel petcock).

Transmission:

Operation, basic maintenance, clutch operation, gearbox lubrication.

Chassis:

Suspension (front and rear adjustment basics), wheels, tires, steering, braking system operation.

Electrical:

Lighting system operation, battery maintenance basics, fuses.

Controls:

Handlebar controls, throttle, clutch lever, brake levers, shifter operation.

Maintenance:

Periodical inspections, lubrication intervals, cleaning procedures, filter checks.

Adjustments:

Clutch adjustment, throttle cable adjustment, brake lever adjustment, chain tension adjustment, basic suspension adjustments.

Troubleshooting:

Basic operational troubleshooting tips for common issues (e.g., starting problems, rough running).

Depth:

Owner-level basic operation, maintenance, and inspection. Does not cover in-depth mechanical repair or complex diagnostics.

📊 Manual Specifications

Digital Format:

N/A (Likely printed)

Print Quality:

Standard print quality for owner's manuals (Black and white illustrations expected).

Binding:

Stapled or Saddle-stitched (Typical for shorter manuals)

Paper Quality:

Standard paper, suitable for informational use, not industrial shop manual grade.

⚙️ Engine Specifications

Engine Type:

4-stroke, single-cylinder, liquid-cooled, LC4 engine family.

Displacement 400:

Approx. 398cc (Specific bore/stroke would be in manual)

Displacement 520:

Approx. 510cc (Specific bore/stroke would be in manual)

Bore Stroke 400:

Refer to manual for exact specifications.

Bore Stroke 520:

Refer to manual for exact specifications.

Horsepower 400:

Estimated 45-50 HP (Model dependent, exact figure in manual).

Horsepower 520:

Estimated 55-60 HP (Model dependent, exact figure in manual).

Torque:

Strong low-to-mid range torque characteristic of the LC4 engine.

Carburetor:

Mikuni VM Series or Keihin (Specific model and size in manual, likely around 38-40mm).

Fuel Type:

Unleaded gasoline (Minimum Octane rating specified in manual).

Oil Type:

Specific motorcycle-grade engine oil (Viscosity and JASO MA standard will be detailed).

Oil Capacity:

Refer to manual for exact capacity (likely separate gearbox/clutch lubrication).

🔧 Transmission

Transmission Type:

6-speed constant mesh gearbox.

Gear Ratios:

Specific gear ratios for each model variant (SX, MXC, EXC) will be detailed in the manual.

Clutch Type:

Wet multi-disc clutch, hydraulically operated.

Final Drive:

Chain drive.

Transmission Oil:

Dedicated transmission oil specification will be provided in the manual.

📐 Dimensions

Seat Height:

Refer to manual for exact specification; typically high for off-road capability.

Ground Clearance:

Refer to manual for exact specification; designed for obstacle clearance.

Dry Weight:

Refer to manual for exact specifications (typically in the ~110-120 kg range).

Fuel Tank Capacity:

Refer to manual for exact specification (typically 8-10 liters).

🛡️ Safety Features

Safety Certification:

N/A for off-road competition motorcycles in terms of automotive crash ratings.

Braking System:

Hydraulic disc brakes front and rear (Brand and specific model of caliper/rotor would be in manual, likely Brembo).

Suspension Compliance:

Upside-down telescopic forks (e.g., WP) and monoshock rear suspension designed for off-road control.

Lighting:

Headlight, taillight, brake light (where applicable by regulation).

Frame Construction:

Chromoly steel trellis frame for strength and rigidity.

💡 Technology Features

Infotainment Features:

None (This is a pure off-road competition/performance motorcycle, no electronic infotainment systems).

Rider Aids:

None (No electronic rider aids like traction control or ABS on these models).

Connectivity Features:

None.

🔧 Maintenance

Oil Change Interval:

Refer to manual for specific mileage/hour intervals (typically 10-15 hours for hard off-road use).

Air Filter Cleaning:

Frequent cleaning/replacement recommended, especially in dusty conditions (specific intervals in manual).

Spark Plug Check:

Regular inspection and gap adjustment recommended (intervals in manual).

Engine Oil Viscosity:

Typically 10W-40 or 20W-50, JASO MA certified (confirm in manual).

Coolant Type:

Ethylene glycol-based coolant with corrosion inhibitors (specific mix ratio in manual).

Brake Fluid Type:

DOT 4 or DOT 5.1 hydraulic brake fluid (confirm in manual).

Transmission Oil Type:

Specific motorcycle gearbox oil, check manual for viscosity and API rating.

Clutch Slave Cylinder:

Early LC4 models could experience issues with the clutch slave cylinder seal, leading to clutch drag (manual may offer basic checks).

Carburetor Tuning:

Mikuni/Keihin carburetors often require careful jetting and adjustment for optimal performance across different altitudes and conditions.

Vibration:

LC4 engines are known for their characterful vibration; proper maintenance helps manage this.

📚 Vehicle History

Ktm Heritage:

KTM has a strong heritage in off-road racing, particularly motocross and rally raid, since its founding in 1934.

Lc4 Engine Development:

The LC4 engine platform was a staple for KTM in the late 20th and early 21st centuries, known for its torque and reliability in demanding conditions.

2001 Model Year Updates:

The 2001 models likely featured refinements to suspension, engine tuning, and chassis based on previous racing feedback. Specific updates are detailed in service manuals.

Manufacturing Location:

Austria (Primary manufacturing for KTM)

🏆 Awards & Recognition

Racing Success:

KTM LC4 platform and its derivatives have a strong history of success in various off-road racing disciplines globally.

Industry Reputation:

KTM has built a reputation for producing durable, competitive, and purpose-built off-road machinery.