This manual provides comprehensive service and repair information for DT125RE and DT125X models produced between 2002 and 2008. These versatile dual-sport motorcycles are celebrated for their reliable two-stroke engines, capable off-road performance, and everyday usability, building upon the legendary DT series heritage. Engineered for durability and rider enjoyment, the DT125 platform offers a blend of agility and power, making it a popular choice for both commuting and adventurous trail riding. This detailed English-language manual covers all aspects of maintenance, troubleshooting, and repair, mirroring the depth and accuracy of factory documentation. It includes step-by-step instructions, diagnostic procedures, and technical specifications for all major systems, from the engine and fuel system to the electrical components and chassis. Whether you are an owner, an independent mechanic, or an enthusiast looking to restore or maintain your DT125RE or DT125X, this manual is an essential resource for ensuring optimal performance and longevity. 🏷️ Basic Information Identification Make: Yamaha Model: DT125RE, DT125X Model Variations Covered: DT125RE, DT125X Years Covered: 2002, 2003, 2004, 2005, 2006, 2007, 2008 Codes Chassis Codes: Likely 5FW for RE, 5VR for X (common for the era, specific confirmation requires manual access) 👋 Introduction Market Position Target Audience: Yamaha DT125RE and DT125X owners, independent repair shops, enthusiast mechanics. Competitive Analysis Value Proposition: Provides professional-grade repair and maintenance information, saving owners significant costs compared to dealership service. Key Features Accessibility: Instant download eliminates shipping costs and waiting times. Documentation Standard: Matches the detail and accuracy found in factory service manuals. 📋 Manual Details Coverage Areas Scope Of Coverage: Comprehensive service, repair, maintenance, diagnostics, restoration Page Count Estimated Page Count: High (typically 300-500+ pages for full service manuals of this type, specific count not provided) Manual Type Type: Full Service Repair Manual Language Language: English Format File Format: PDF Delivery Method: Instant Download Compatibility: All Windows versions, Mac, Printable Requirements: Adobe PDF Reader, WinRAR 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, cylinder head, piston, crankshaft, connecting rod, lubrication system, cooling system (if applicable), cylinder block. Fuel System: Carburetor (Mikuni VM series typical), fuel tank, fuel lines, fuel pump (if equipped), air filter. Ignition System: CDI ignition, spark plug, ignition coil, stator, rotor, wiring. Exhaust System: Exhaust pipe, muffler, emissions control (if applicable). Transmission Drivetrain: Clutch operation, gearbox (6-speed manual typical), gear shift mechanism, final drive (chain). Suspension: Front forks (conventional or USD depending on variant), rear monoshock or twin shock absorber, linkages, swingarm. Brakes: Front disc brake, rear disc or drum brake (depending on model variant), hydraulic system, caliper, master cylinder, brake fluid specifications. Wheels Tires: Wheel bearing, spokes, rim maintenance, tire types, inflation pressures. Electrical System: Wiring diagrams, battery, charging system (alternator/stator), lighting (headlight, taillight, indicators), horn, starter (if electric start equipped), instrument cluster. Frame Bodywork: Frame inspection, body panel removal/installation, seat, fuel tank, fenders, handlebars, controls. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, chain adjustment, brake bleeding, spark plug replacement, carburetor cleaning/adjustment. Troubleshooting: Diagnostic procedures for common issues, electrical system troubleshooting, engine performance problems, starting difficulties. Repair: Detailed step-by-step repair instructions for all major components and systems, including engine rebuilds, suspension overhaul, brake system repairs. Diagnostics: Systematic diagnostic approaches, electrical testing with multimeter, fault finding for ignition and fuel systems. Technical Depth Depth: Full factory-level detail, suitable for professional technicians and advanced DIY mechanics. Illustrations: Detailed illustrations, drawings, and photos for each procedure. Instructions Format: Numbered steps, notes, cautions, warnings, bold figure numbers for easy reference. 📊 Manual Specifications File Format Quality: PDF, Full Printable Print Quality Printability: All pages are printable. Binding Type Binding Type: Digital (PDF download) Paper Type Paper Type: Not Applicable (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, liquid-cooled, single-cylinder Displacement: 124 cc (approximate) Bore X Stroke: Typically around 56.0 mm x 50.7 mm (verify with manual) Compression Ratio: Likely around 7.0:1 - 8.5:1 (verify with manual) Performance Horsepower: Approximately 15-20 HP (varies by market and specific model tune, verify with manual) Torque: Approximately 1.2-1.5 kg-m or 12-15 Nm (verify with manual) Fuel System Carburetor Type: Mikuni VM28 or similar (confirm specific model) Fuel Type: Unleaded gasoline with appropriate 2-stroke oil pre-mix or autolube system Lubrication Lubrication Type: Autolube (oil injection system) or pre-mix (verify specific model) 🔧 Transmission Standard Type: 6-speed constant mesh, sequential Clutch Type: Wet, multi-disc, cable-operated Features Gear Ratios: Specific ratios available within the manual 📐 Dimensions Exterior Wheelbase: Approximately 1390 mm (verify with manual) Weights Curb Weight: Approximately 110-125 kg (verify with manual) Fuel Capacity: Approximately 10-12 liters (verify with manual) 🛡️ Safety Features Ratings Safety Features Coverage: Manual covers inspection and maintenance of safety systems like brakes and lighting. Active Features Brakes: Front hydraulic disc, Rear disc (RE) or Drum (X variant often had drum, verify). 💡 Technology Features Infotainment Instrument Cluster: Analog speedometer, tachometer, odometer, trip meter, indicator lights (turn signals, high beam, neutral)....