This manual covers the 2003 DR-Z125K3, an entry-level, recreational off-road motorcycle designed for beginner and youth riders. Known for its robust and dependable performance, the DR-Z125K3 features straightforward engineering, making it easy to maintain and repair. Its lightweight and agile design provides confidence-inspiring handling, positioning it as a strong competitor in its segment. The DR-Z line represents a commitment to accessible and enjoyable off-road riding, with the 125cc model serving as an excellent entry point into the sport. This comprehensive Service and Repair Manual provides detailed information for the maintenance and repair of your 2003 DR-Z125K3. It covers complete engine overhaul, fuel system maintenance, ignition system adjustments, transmission and clutch service, suspension and brake system maintenance, and electrical system troubleshooting. The manual includes routine maintenance procedures, disassembly and assembly instructions, diagnostic guides, and precise torque specifications. This resource is designed to assist owners, mechanics, and technicians in keeping the vehicle in optimal condition, ensuring its reliability and performance. 🏷️ Basic Information Identification Make: Suzuki Model: DR-Z125K3 Year: 2003 Codes Chassis Code: DR125K3 👋 Introduction Market Position Segment: Entry-level, recreational off-road motorcycle (dirt bike). Target Audience: Beginner riders, youth riders, and those seeking a simple, reliable off-road machine. Competitive Analysis Key Competitors: Honda CRF100F/CRF125F, Yamaha TT-R125, Kawasaki KLX125. Key Features Reliability: Known for its robust and dependable performance in off-road conditions. Simplicity: Straightforward engineering makes it easy to maintain and repair. Maneuverability: Lightweight and agile, offering confidence-inspiring handling for new riders. 📋 Manual Details Coverage Areas Manual Type: Service and Repair Manual Language: English Format: PDF 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, including disassembly, inspection, assembly, timing, valve adjustments, and troubleshooting. Fuel System: Carburetor tuning, cleaning, and overhaul; fuel tank and line inspection and maintenance. Ignition System: CDI unit, spark plug specifications, ignition timing adjustments. Transmission: Gearbox disassembly, inspection, and assembly; clutch operation and maintenance. Suspension: Front fork service, rear shock absorber inspection and service, linkage maintenance. Brakes: Front and rear brake system overhaul, pad replacement, fluid bleeding, caliper maintenance. Electrical System: Wiring diagrams, lighting system maintenance, battery service, starter system troubleshooting. Cooling System: Air-cooled engine specifications and maintenance procedures. Frame And Bodywork: Chassis inspection, body panel removal and installation, seat and tank maintenance. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, air filter cleaning, spark plug replacement. Troubleshooting: Diagnostic charts and common problem-solving guides for various systems. Disassembly And Assembly: Detailed step-by-step instructions for major component removal and reinstallation. Torque Specifications: Precise torque values for all critical fasteners. Rebuild Procedures: Comprehensive instructions for engine and transmission rebuilds. Technical Depth Depth: Complete diagnostic and repair information suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Searchable text for quick information retrieval. Printability: Printable pages for on-the-go reference. Print Quality Image Resolution: High-resolution images and diagrams for clarity. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, SOHC, air-cooled Displacement: 124 cc Bore X Stroke: 52.0 mm x 57.6 mm Compression Ratio: 9.5:1 Performance Horsepower: Approximately 10-12 HP (estimated, actual may vary) Torque: Approximately 7-8 lb-ft (estimated, actual may vary) Fuel System Carburetor Model: Mikuni VM20SS Fuel Capacity: 1.7 US gal (6.4 L) Fuel Type: Unleaded gasoline 🔧 Transmission Standard Transmission Type: 5-speed manual Clutch Type: Wet multi-plate Features Gear Ratios: Detailed in manual, typically close-ratio for off-road use. Final Drive: Chain drive 📐 Dimensions Exterior Overall Length: 73.0 inches (1855 mm) Overall Width: 31.3 inches (795 mm) Overall Height: 43.5 inches (1105 mm) Wheelbase: 50.0 inches (1270 mm) Ground Clearance: 10.0 inches (255 mm) Weights Dry Weight: 196.2 lbs (89 kg) Curb Weight: N/A (typically quoted dry) Cargo Cargo Capacity: N/A (No cargo provisions) 🛡️ Safety Features Ratings Crash Safety: N/A (Off-road vehicle, not subject to road safety ratings). Active Features Braking System: Front: Disc brake, Rear: Drum brake. Passive Features Lighting: Headlight, taillight, brake light. 💡 Technology Features Infotainment Infotainment System: N/A (Basic recreational off-road motorcycle). Driver Assistance Assistance Features: N/A Connectivity Connectivity Options: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Every 1000 km (600 miles) or 6 months, whichever comes first (refer to manual for specifics). Air Filter Cleaning: Every 500 km (300 miles) or as needed depending on riding conditions. Spark Plug Replacement: Approximately every 3000 km (2000 miles) or as needed. Valve Clearance Check: Every 6000 km (4000 miles) or annually. Fluid Specifications Engine Oil Type: SAE 10W-40 API SE or SF (refer to manual for exact specification). Engine Oil Capacity: Approximately 0.8 L (0.85 US qt) without filter change; 0.9 L (0.95 US qt) with filter change. Brake Fluid Type: DOT 3 or DOT 4. Known Issues Carburetor Clogging: Common issue on older dirt bikes, requiring regular cleaning and proper fuel storage. Chain And Sprocket Wear: Requires regular...