This manual covers the DT125, including the DT125RE and DT125X variants, produced between 2002 and 2008. The DT series has a long-standing reputation for durability and off-road capability, representing a refinement of this lineage with modernizations for performance and emissions. These models typically feature a 124cc two-stroke, liquid-cooled engine with a 6-speed manual transmission and a wet, multi-plate clutch, often incorporating a Power Valve System (YPVS) for enhanced performance across the rev range. This comprehensive workshop service repair manual provides detailed instructions for all aspects of maintenance, repair, and troubleshooting. It covers essential systems including engine mechanical and electrical components, fuel and emission control systems, transmission, suspension, steering, and brakes, as well as bodywork and electrical systems. With step-by-step procedures, detailed illustrations, wiring diagrams, and diagnostic guides, this manual is an invaluable resource for owners and technicians alike to ensure the optimal performance and longevity of their DT125. 🏷️ Basic Information Identification Make: Yamaha Model: DT125 Variant: DT125RE, DT125X Model Years Covered: 2002, 2003, 2004, 2005, 2006, 2007, 2008 Codes Engine Codes: Likely 3RM (specific to DT125RE/X generation, further confirmation would require manual access) 👋 Introduction Market Position Target Audience: Owners of Yamaha DT125, DT125RE, and DT125X models from 2002-2008 seeking to perform maintenance, repairs, and diagnostics. Competitive Analysis Value Proposition: Offers a cost-effective solution for maintaining vehicle reliability and performance, empowering owners to handle tasks typically reserved for professional mechanics. Key Features Features: Detailed illustrations, diagrams, wiring schematics, step-by-step instructions, notes/cautions/warnings, numbered instructions, printable pages. Brand Heritage Yamaha Legacy: Yamaha is renowned for its robust and reliable motorcycles, particularly in the dual-sport and off-road segments, with a history of innovative engineering and performance. Model Evolution Dt125 Lineage: The DT series has a long-standing reputation for durability and off-road capability. The 2002-2008 models represent a refinement of this lineage, likely incorporating modernizations for performance and emissions while retaining the core DT spirit. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service, repair, maintenance, and troubleshooting Specific Systems Highlighted: Engine Mechanical, Engine Electrical, Emission Control, Fuel System, Suspension, Clutch, Manual Transaxle, Steering, Brakes, Body Interior/Exterior, Body Electrical, Restraint Page Count Estimated Page Count: Variable, but described as 'complete service manual' covering 'every detail'. Expect 500+ pages for a full workshop manual. Manual Type Type: Workshop Service Repair Manual, Factory Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed disassembly, assembly, inspection, and repair of all engine components including cylinder, piston, crankshaft, connecting rod, and valve train (if applicable). Engine Electrical: Comprehensive coverage of ignition system, charging system, starting system, lighting, and sensors with detailed wiring diagrams. Fuel System: Carburetor (likely a Mikuni VM series for this era) service, adjustment, and troubleshooting; fuel pump and filter maintenance. Transmission Drivetrain: Clutch operation, adjustment, and replacement; manual transaxle disassembly, inspection, and repair; driveshaft and axle service. Suspension Steering Brakes: Front fork disassembly, seal replacement, and fluid specification; rear shock absorber service; steering head bearing maintenance; front and rear brake system inspection, fluid replacement, pad/shoe replacement, and hydraulic system troubleshooting. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, spark plug service, air filter cleaning/replacement, brake adjustments. Diagnostic Troubleshooting: Step-by-step troubleshooting guides for common issues, electrical system diagnostics using wiring diagrams. Repair Overhaul: Detailed instructions for component replacement, engine rebuilds, transmission overhauls, and bodywork repairs. Wiring Schematics: Complete and detailed wiring diagrams for all electrical systems. Technical Depth Depth: Comprehensive, suitable for both novice DIYers and experienced professional mechanics. Covers everything from basic adjustments to full engine and transmission rebuilds. 📊 Manual Specifications File Format Format: PDF Readability: Searchable text (likely, depending on PDF creation), zoomable Print Quality Printability: Fully printable Binding Type Digital Binding: N/A (Digital Download) Paper Type Digital Paper Type: N/A (Digital Download) Software Requirements Requirements: Adobe PDF Reader, WinZip (for potential .zip packaging) Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, liquid-cooled (likely for RE/X models, air-cooled for base DT125 if different variants existed within the generation) Displacement: 124cc (typical for DT125) Bore X Stroke: Specific to engine code, e.g., 56.5 mm x 44.5 mm (requires manual confirmation) Performance Horsepower: Typically around 15-20 HP, depending on market and specific model variant (e.g., power-restricted versions for certain licensing). Torque: Specific torque figures would be detailed in the manual. Fuel System Carburetor Type: Likely a single Mikuni VM28SS or similar. Fuel Delivery: Carburetor Emission Control System: Likely includes features like YPVS (Yamaha Power Valve System) for improved performance and emissions control across the rev range. 🔧 Transmission Standard Type: 6-speed manual transmission Optional Type: N/A (manual transmission is standard) Features Clutch: Wet, multi-plate Gear Ratios: Specific gear ratios are detailed within the manual for precise performance analysis. 📐 Dimensions Exterior Length: Approx. 2,140 mm (varies slightly by model variant) Width: Approx. 800 mm (varies slightly...