🏷️ Basic Information

Make:

KTM

Model:

625 LC4

Year:

2003

Chassis Code:

LC4 Series (Specific VIN prefix for 2003 model)

Engine Code:

LC4 (Single-cylinder, 4-stroke)

👋 Introduction

Market Position:

The 2003 KTM 625 LC4 was positioned as a potent dual-sport or supermoto motorcycle, known for its powerful single-cylinder engine, robust chassis, and off-road derived performance adapted for street use. It appealed to riders seeking a versatile machine with significant torque and a focus on performance.

Competitive Analysis:

Competed against other high-performance dual-sport and supermoto offerings from manufacturers like Husqvarna, BMW (G-series), and other specialized off-road brands adapting models for street legality. Its LC4 engine provided a distinctive character and power delivery.

Key Features:

LC4 single-cylinder engine, capable of both spirited street riding and light off-road excursions, robust suspension, powerful brakes, distinctive KTM styling.

📋 Manual Details

Coverage Areas:

Operation, Maintenance, Troubleshooting, Specifications for 2003 KTM 625 LC4 Motorcycle

Page Count:

62

Manual Type:

Owner's Manual

Language:

English (Likely, based on typical KTM manuals for this era and market)

Format:

PDF

📖 Manual Coverage

Systems Covered:

Engine, Fuel System, Ignition System, Cooling System, Lubrication System, Transmission, Clutch, Brakes, Suspension (Front and Rear), Wheels and Tires, Electrical System (Lighting, Ignition, Starter), Controls, Frame, Bodywork, Safety Features

Procedures Included:

Pre-ride Inspection, Routine Maintenance, Fluid Checks and Replacements, Filter Replacements (Air, Oil), Spark Plug Maintenance, Chain Adjustment and Lubrication, Brake Pad Inspection and Replacement, Tire Pressure Checks, Suspension Adjustments, Troubleshooting Common Issues, Basic Electrical Checks, Starting Procedures, Riding Precautions

Technical Depth:

Covers essential owner-level maintenance, adjustments, and basic troubleshooting. It is not a comprehensive workshop/service manual for major repairs or rebuilds but provides the necessary information for regular upkeep and understanding of the motorcycle's systems.

📊 Manual Specifications

File Format:

PDF (Portable Document Format), ensuring broad compatibility and accessibility across devices.

Print Quality:

The PDF is expected to be a high-resolution scan or digital creation, suitable for clear viewing and printing of diagrams, text, and specifications.

Binding Type:

N/A (Digital PDF format)

Paper Type:

N/A (Digital PDF format, but original manual would have been on standard paper stock)

⚙️ Engine Specifications

Engine Type:

Single-cylinder, 4-stroke, Liquid-cooled

Displacement:

625 cc (Approximately, based on LC4 family designation)

Bore X Stroke:

Typically around 100 mm x 80 mm for LC4 600/620/625 variants (exact spec confirmed in manual).

Compression Ratio:

Likely in the range of 11.0:1 to 12.0:1 (Specific value in manual).

Valve Train:

SOHC, 4 valves per cylinder (Operated by rocker arms)

Horsepower:

Estimated 50-60 HP (Exact figure in manual, varies slightly with tuning and emissions for the specific market).

Torque:

Estimated 55-60 Nm (Exact figure in manual).

Fuel Delivery:

Carburetor (Likely Mikuni VM or Keihin FCR, with specific model and size detailed in manual).

Fuel Type:

Unleaded gasoline, minimum octane rating specified in manual (e.g., 91 RON).

Oil Type:

High-quality 4-stroke motorcycle engine oil, specific viscosity grade (e.g., 10W-50 or 15W-50) and JASO MA specification required. (Exact specification in manual).

Oil Capacity:

Approximately 1.5-1.8 liters (Exact capacity with/without filter change in manual).

🔧 Transmission

Transmission Type:

5-speed constant mesh gearbox

Gear Ratios:

Specific gear ratios for each of the 5 speeds will be detailed in the manual. These are critical for performance tuning and understanding riding characteristics.

Clutch Type:

Wet multi-plate clutch, hydraulically actuated.

Final Drive:

Chain drive

Transmission Oil:

Dedicated transmission oil is not typically used; engine oil lubricates the gearbox in this design. (Confirmation and specific checks in manual).

📐 Dimensions

Overall Length:

Specific dimensions will be listed in the manual; typically around 2200-2300 mm.

Overall Width:

Specific dimensions will be listed in the manual; typically around 850-900 mm.

Seat Height:

High for a dual-sport, likely around 900-950 mm (unladen). Exact measurement in manual.

Dry Weight:

Approximately 145-155 kg (Without fluids, depending on specific configuration). Exact figure in manual.

Wet Weight:

Approximately 160-170 kg (With all fluids). Exact figure in manual.

Fuel Tank Capacity:

Around 12-15 liters (Specific capacity in manual).

🛡️ Safety Features

Braking System Front:

Hydraulic disc brake, single or dual disc configuration depending on model variant. Specific caliper and disc size details in manual.

Braking System Rear:

Hydraulic disc brake. Specific caliper and disc size details in manual.

ABS:

ABS was not a standard or common option on dual-sport/supermoto models of this era, particularly KTM. Likely not equipped.

Lighting:

Headlight, Taillight, Brake Light, Turn Signals (if street-legal configuration). Specification of bulbs in manual.

Safety Warnings:

The manual will contain critical safety warnings regarding operation, maintenance, rider protection, and vehicle modifications.

💡 Technology Features

Infotainment System:

Basic motorcycle instrumentation: speedometer, odometer, trip meter, tachometer, neutral indicator, oil pressure warning light, turn signal indicators, high beam indicator. No advanced infotainment systems.

Driver Assistance Features:

No electronic driver assistance features like traction control or ABS are expected on this model. Rider aids are purely mechanical and based on rider skill.

Connectivity Options:

No electronic connectivity features (Bluetooth, Wi-Fi, etc.) are present on this model.

🔧 Maintenance

Oil Change Interval:

Typically every 3,000-5,000 km or annually, whichever comes first. (Precise interval in manual).

Air Filter Cleaning Interval:

Recommended every 1,000-2,000 km, especially in dusty conditions. (Specific interval and cleaning procedure in manual).

Spark Plug Replacement Interval:

Around 5,000-10,000 km, depending on plug type and usage. (Specific recommendation in manual).

Valve Clearance Check Interval:

Typically every 5,000-10,000 km. Critical for maintaining engine performance and longevity. (Exact interval and procedure in manual).

Coolant Type:

Ethylene glycol-based antifreeze/coolant with corrosion inhibitors. Specific mixture ratio (e.g., 50/50 water/coolant) and type (e.g., pre-mixed or concentrate) specified in manual.

Brake Fluid Type:

DOT 4 or DOT 5.1 hydraulic brake fluid. (Specific type and DOT rating in manual).

Fork Oil Type And Level:

Specific suspension fluid grade (e.g., SAE 10W) and level will be detailed. Crucial for proper suspension performance. (Specification in manual).

Known Issues General:

LC4 engines are generally robust but can be prone to vibration, occasional carburetor tuning sensitivity, and the need for regular maintenance on wear items like the cam chain tensioner and clutch plates. The manual provides guidance on normal operation and maintenance to mitigate these.

Maintenance Focus Points:

The manual will emphasize proper oil changes, air filter maintenance, valve adjustments, and chain lubrication as key preventative measures for the LC4 engine.

📚 Vehicle History

Brand Heritage:

KTM AG is an Austrian manufacturer of motorcycles and sport ATVs, known for its off-road racing pedigree and its 'Ready to Race' philosophy. The LC4 platform has been a cornerstone of their success in various off-road and dual-sport categories for decades.

Model Evolution:

The 625 LC4 is part of the long-standing LC4 family, which evolved from earlier 560cc and 600cc models. It represents a refinement of KTM's large-bore single-cylinder engine technology, offering increased displacement and power for enhanced performance across a broader range of use.

Production Years Lc4 Series:

The LC4 platform has been in production for many years, with various displacements and iterations. The 625cc variant was prominent in the early to mid-2000s.

🏆 Awards & Recognition

Motorcycle Awards:

While specific awards for the 2003 625 LC4 might not be widely publicized, the LC4 platform as a whole has received acclaim from motorcycle publications for its performance, versatility, and off-road capabilities across its various iterations.

Reliability Reputation:

The LC4 engine has a reputation for being a powerful and durable unit, provided it receives diligent maintenance. Owner satisfaction often hinges on adherence to the manufacturer's recommended service intervals.