🏷️ Basic Information Identification Make: Yamaha Model: DT125R Applicable Years: 1987, 1988 Codes Engine Code Range: Likely 1G2/1GE series based on typical Yamaha designations for this era, specific codes require manual confirmation. Chassis Code Range: Likely 1G2/1GE series for the DT125R, specific codes require manual confirmation. 👋 Introduction Market Position Target Audience: Yamaha DT125R owners, mechanics, restorers, and enthusiasts seeking detailed repair and maintenance information. Competitive Analysis Value Proposition: Provides the same in-depth information used by professional technicians, enabling owners to perform complex repairs and maintenance themselves, saving significant costs. Key Features Illustration Quality: Detailed illustrations, drawings, and photos to guide procedures, including enlarged inset views for critical components. Navigability: Numbered table of contents for quick information retrieval and bold figure numbers to match illustrations with instructions. Safety Notes: Includes notes, cautions, and warnings throughout to highlight critical safety and procedural information. 📋 Manual Details Coverage Areas General Coverage: Full Service Repair Specific Systems: Engine, Transmission, Fuel System, Ignition System, Electrical System, Chassis, Suspension, Brakes, Cooling System, Lubrication System, Bodywork, Troubleshooting, Wiring Diagrams. Page Count Estimated Page Count: While not explicitly stated, comprehensive full service repair manuals for this era typically range from 300 to 600+ pages depending on the detail. Manual Type Manual Type: Service and Repair Manual Language Language: English Format File Format: PDF Delivery Method: Instant Download Compatibility: All Windows and Mac versions 📖 Manual Coverage Systems Covered Engine Overhaul: Yes, includes detailed breakdown, assembly, and tuning procedures for the 125cc two-stroke engine. Transmission Service: Yes, covering gearbox, clutch, and shifting mechanism maintenance and repair. Electrical Diagnostics: Yes, with comprehensive wiring diagrams for ignition, lighting, and other electrical components. Suspension And Steering: Yes, including fork and rear shock absorber servicing, along with steering head bearing maintenance. Braking System: Yes, covering hydraulic front disc and rear drum brake system maintenance and component replacement. Procedures Included Routine Maintenance: Yes, including oil changes, chain adjustment, filter cleaning/replacement, spark plug service. Troubleshooting Guide: Yes, detailed diagnostic procedures for common and uncommon issues. Rebuilding And Reconditioning: Yes, designed for full restoration and component rebuilding. Torque Specifications: Yes, essential for proper assembly and component longevity. Technical Depth Diagnostic Capabilities: Advanced, covering electrical circuit tracing and component testing. Repair Scope: Comprehensive, suitable for professional technicians and experienced DIY enthusiasts. 📊 Manual Specifications File Format PDF Quality: High Resolution, fully printable. Print Quality Printability: All pages are printable, allowing for on-the-bench use. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Requirements Software Requirements: Adobe PDF Reader, WinRAR (for potential archive extraction). ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, liquid-cooled, single-cylinder Displacement: 123 cc (7.5 cubic inches) Bore X Stroke: Typically 56.4 mm x 50.0 mm for this model, but manual confirmation is advised. Compression Ratio: Likely around 7.2:1 or similar for this era of two-stroke, manual confirmation needed. Performance Horsepower Output: Approx. 21-23 hp at 8000 rpm (subject to regional tuning and specific model variant, manual confirmation required). Torque Output: Approx. 19-20 Nm at 7000 rpm (subject to regional tuning and specific model variant, manual confirmation required). Fuel System Carburetor Type: Mikuni VM28SS or similar, with specific jetting and adjustment procedures detailed in the manual. Fuel Type: Unleaded gasoline with a recommended octane rating (e.g., 95 RON) and a proper two-stroke oil mix (typically 50:1 or as specified). 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Features Clutch Type: Wet, multiple disc Final Drive: Chain drive 📐 Dimensions Exterior Overall Length: Varies slightly by model year but typically around 2050-2100 mm. Overall Width: Varies, but typically around 800-830 mm. Overall Height: Varies, but typically around 1160-1180 mm. Weights Dry Weight: Approximately 115-120 kg. Gross Vehicle Weight Rating: Manual will specify, but typically around 250-270 kg. 🛡️ Safety Features Active Features Braking System Front: Hydraulic disc brake Braking System Rear: Drum brake Passive Features Lighting: Headlight, taillight, turn signals (all covered in electrical section). 💡 Technology Features Infotainment Infotainment Systems: N/A - This is a 1980s era motorcycle with no modern infotainment systems. Driver Assistance Electronic Aids: N/A - No electronic rider aids. Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific mileage/time recommendations for engine oil and 2-stroke oil injection system. Typically every 2000-3000 km. Spark Plug Service: Refer to manual for recommended service interval and plug type (e.g., NGK BR9ES or equivalent). Air Filter Cleaning: Regular inspection and cleaning, especially if used in dusty conditions. Interval will be specified in manual. Fluid Specifications Engine Oil: Manual will specify viscosity grade (e.g., SAE 10W-30 or 10W-40) and API classification for the gearbox oil. Typically a dedicated gearbox oil is used. Two Stroke Oil: High-quality JASO FD or API TC certified two-stroke engine oil for the oil injection system. Coolant Type: Ethylene glycol-based coolant, mixed 50/50 with distilled water for the liquid-cooled...