This manual covers the DT125, a versatile dual-sport motorcycle with variants including the DT125RE, DT125XE, and DT125X, produced in 2005. Known for a legacy of reliability and performance-oriented engineering, the DT series has a long-standing reputation for durability and off-road capability, evolving into refined dual-sport models. The 2005 DT125 is equipped with a 2-stroke, liquid-cooled engine featuring the Power Valve System (YPVS) and a 6-speed transmission, offering a balance of power and usability for various riding conditions. This comprehensive factory service repair manual provides in-depth information for maintaining and repairing the DT125. It details procedures for the engine, transmission, electrical system, chassis, bodywork, suspension, and brakes. Coverage includes routine maintenance tasks such as oil changes and chain adjustments, as well as major repairs like engine rebuilds and suspension overhauls. The manual also offers troubleshooting guides, wiring diagrams, torque specifications, and information on special tool requirements, making it an essential resource for both do-it-yourself owners and professional mechanics. 🏷️ Basic Information Identification Make: Yamaha Model: DT125 Model Variants: DT125RE, DT125XE, DT125X Year: 2005 👋 Introduction Market Position Target Audience: Do-it-yourselfers and experienced mechanics alike. Competitive Analysis Value Proposition: Inexpensive way to keep the vehicle working properly, comprehensive information. Key Features Detail Level: Hundreds of pages with detailed substeps, notes, cautions, warnings, and hundreds of photos/illustrations. Navigation: Numbered table of contents for quick information retrieval. 📋 Manual Details Coverage Areas Engine: Included Transmission: Included Electrical System: Included Chassis: Included Bodywork: Included Suspension: Included Brakes: Included Cooling System: Included Fuel System: Included Exhaust System: Included Wheels And Tires: Included Troubleshooting: Included Page Count Estimated Pages: Hundreds (exact number not specified, but implies extensive content) Manual Type Type: Factory Service Repair Manual / Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Complete disassembly and reassembly instructions for engine components. Engine Tuning: Carburetor adjustment, ignition timing, and performance tuning guidelines. Transmission Operation: Details on gearbox components, clutch, and shifting mechanisms. Electrical Diagnostics: In-depth troubleshooting for lighting, ignition, charging, and starter systems. Suspension And Steering: Fork servicing, shock absorber adjustments, and steering head bearing maintenance. Braking System: Hydraulic brake component servicing, bleeding procedures, and pad replacement. Fuel And Emission Control: Carburetor service, fuel lines, and basic emission control system information. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, spark plug checks. Major Repairs: Engine rebuilds, transmission overhauls, and suspension component replacement. Troubleshooting Guides: Step-by-step diagnostic procedures for common and complex issues. Wiring Diagrams: Detailed electrical schematics for all vehicle systems. Torque Specifications: Precise torque values for all critical fasteners. Special Tool Requirements: Identification of specialized tools needed for specific procedures. Technical Depth Depth: Comprehensive factory-level detail suitable for both DIY enthusiasts and professional mechanics. 📊 Manual Specifications File Format Format: PDF Compatibility: All PC-based Windows operating systems and Mac. Print Quality Printability: Printable without any restriction, entire manual or specific pages. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) File Characteristics Searchability: Implied (standard for PDF, beneficial for quick reference) Delivery Method Delivery: Instant download link on checkout page post-payment. Software Requirements Reader Requirement: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Type: 2-stroke, Liquid-cooled, Reed valve, YPVS (Yamaha Power Valve System) Displacement: 124 cc (approximate) Performance Horsepower Estimate: Typically around 20-25 HP (varies by specific model variant and tuning) Torque Estimate: Approximately 1.5 - 1.8 kgf-m (varies by specific model variant and tuning) Fuel System Carburetion: Mikuni VM series (e.g., VM28SS on some variants) Fuel Type: Unleaded gasoline (recommendation usually 91 octane or higher) Lubrication Oil System: Autolube system (premix oil injected into fuel) 🔧 Transmission Standard Type: Constant mesh, 6-speed, claw shift Features Clutch: Wet, multiple-disc Gear Ratios: Specific ratios are detailed within the manual for each gear. 📐 Dimensions Exterior Length Estimate: Varies by model variant, typically around 2000-2100 mm Width Estimate: Varies by model variant, typically around 800-850 mm Height Estimate: Varies by model variant, typically around 1100-1200 mm Weights Dry Weight Estimate: Around 100-110 kg (varies by model variant) Fuel Tank Capacity Estimate: Approximately 9-11 liters 🛡️ Safety Features Ratings Safety Standards: Manual covers safe operating procedures and maintenance for safety compliance. Active Features Braking System: Front and rear disc brakes on most variants (DT125X typically front and rear disc). Passive Features Lighting System: Headlight, taillight, brake light, turn signals (coverage in electrical section). 💡 Technology Features Infotainment Features: Not applicable; this is a mechanical and electrical service manual, not an owner's manual for infotainment features. Driver Assistance Features: Not applicable; this is a mechanical and electrical service manual. Connectivity Features: Not applicable; this is a mechanical and electrical service manual. 🔧 Maintenance Service Intervals Oil Change Engine: Refer to manual for specific recommendations based on usage (typically every few thousand kilometers or annually). Spark Plug Inspection: Regular inspection and cleaning/replacement intervals detailed in the manual....