This manual covers the DT125RE and DT125X models, produced between 2002 and 2008. These motorcycles are built upon a strong heritage in off-road performance and dual-sport capability, offering a blend of reliability and agility. With a liquid-cooled, 2-stroke, 124cc engine, they are designed for versatile use, suitable for both on-road commuting and off-road exploration. Notable features include a 6-speed transmission, disc brakes, and robust suspension systems, reflecting a commitment to engineering quality and rider experience in this iconic series. This comprehensive service repair workshop manual provides detailed information essential for maintaining and repairing your DT125RE or DT125X. It includes step-by-step instructions for routine maintenance, periodic checks, and complex repair procedures across all major systems, including the engine, fuel, electrical, transmission, suspension, and braking systems. With detailed diagrams, illustrations, and wiring schematics, this manual serves as an indispensable resource for owners, independent repair shops, and professional motorcycle mechanics, enabling efficient troubleshooting and ensuring optimal performance and longevity of the vehicle. 🏷️ Basic Information Identification Make: Yamaha Model: DT125 Model Variant: DT125RE, DT125X Model Years Covered: 2002, 2003, 2004, 2005, 2006, 2007, 2008 Codes Chassis Codes: DT125RE (e.g., 5FW1, 5FW2), DT125X (e.g., 4SP1) 👋 Introduction Market Position Target Audience: Yamaha DT125RE/DT125X owners, independent repair shops, motorcycle mechanics Competitive Analysis Value Proposition: Provides dealership-level service information, enabling cost savings on maintenance and repairs, and empowering owners with knowledge. Key Features Features: Step-by-step instructions, detailed diagrams, illustrations, wiring schematics, comprehensive specifications, troubleshooting guide 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service, repair, and maintenance for Yamaha DT125RE and DT125X models Page Count Estimated Page Count: Likely 300+ pages (typical for comprehensive service manuals) Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download Compatibility: Compatible with all versions of Windows and Mac OS Viewing Requirements: Adobe PDF Reader Download Speed: Fast Download Manual Specifications File Format Details: High-resolution PDF with searchable text and embedded images/diagrams Print Quality: Printable pages allowing for individual section printing Binding Type: N/A (Digital Download - PDF) Paper Type: N/A (Digital Download - PDF) 📖 Manual Coverage Systems Covered Engine: Engine specifications, removal/installation, internal components, troubleshooting Fuel System: Carburetor (settings, cleaning, repair), fuel lines, fuel tank Cooling System: Radiator, coolant, hoses, water pump Transmission: Gearbox operation, removal, installation, internal components, maintenance Drive Train: Drive chain, sprockets (maintenance, replacement) Electrical System: Ignition system, lighting, battery, charging system, wiring diagrams, troubleshooting Suspension: Front forks, rear shock absorbers (maintenance, adjustment, repair) Brakes: Front and rear brake systems (discs, calipers, master cylinders, bleeding, adjustments) Steering System: Handlebars, steering stem, bearings (maintenance, adjustment) Body Work: Fairings, seat, fenders, plastics (removal, installation, care) Intake Exhaust: Airbox, exhaust system (maintenance, inspection) Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustments, bolt torquing, general inspections Periodic Checks Adjustments: Valve clearance (if applicable to 2-stroke), clutch, throttle, brake lever adjustments Troubleshooting: Diagnostic procedures for common and advanced issues Repair: Step-by-step instructions for component repair and replacement Disassembly Reassembly: Detailed procedures for major component removal and installation Technical Depth Depth: Complete workshop level (suitable for professional technicians and experienced DIYers) Manual Specifications Included Diagrams: Detailed exploded views and assembly diagrams for all major components Included Schematics: Complete electrical wiring diagrams for the entire motorcycle ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 2-stroke, reed valve induction Bore X Stroke: 56.5 mm x 50.7 mm (Typical for DT125R/RE, confirm for X variant) Displacement: 124 cc Compression Ratio: Approximately 7.2:1 (check specific model for exact) Performance Horsepower: Approx. 23-26 HP (Varies by market and specific model variant, e.g., RE vs. X) Torque: Approx. 20-22 Nm (Varies by market and specific model variant) Fuel System Carburetor Model: Mikuni VM28 (Typical for DT125RE, confirm for X variant) Fuel Type: Unleaded gasoline (Octane rating as specified in manual) Oil Mixture: Pre-mix or Autolube system (as specified by Yamaha) 🔧 Transmission Standard Type: 6-speed constant mesh Optional N/A: N/A Features Clutch Type: Wet, multiple-disc Transmission Oil Type: Yamalube 2-stroke oil or equivalent (Specific grade listed in manual) 📐 Dimensions Exterior Overall Length: Approx. 2,150 mm (Varies slightly between RE and X) Overall Width: Approx. 800-830 mm Overall Height: Approx. 1,210-1,225 mm Weights Dry Weight: Approx. 128-133 kg Fuel Tank Capacity: Approx. 10 Liters Wheels Tires Front Tire Size: 80/90-21 48P (Typical for RE, X may differ) Rear Tire Size: 110/80-18 58P (Typical for RE, X may differ) 🛡️ Safety Features Ratings N/A: N/A (Motorcycle safety ratings typically not published in the same manner as cars) Active Features Brakes: Disc brakes (Front and Rear) Passive Features Lighting: Headlight, taillight, brake lights, turn signals 💡 Technology Features Infotainment N/A: N/A (Basic instrumentation typical for this era of dual-sport motorcycle) Driver Assistance N/A: N/A Connectivity N/A: N/A 🔧 Maintenance Service Intervals Engine Oil Change: Every 3,000-5,000 km or annually (Consult manual for precise interval and oil type) Spark Plug Inspection: Every 2,000-3,000 km...