The DT125R, produced from 1988 to 2002, is a robust and versatile dual-sport motorcycle renowned for its off-road capability and enduring reliability. Building on a rich heritage in motorcycle manufacturing, the DT125R offers a balance of performance and practical usability, making it a favored choice for recreational trail riding and light commuting. Its engineering prioritizes durability and ease of maintenance, reflecting a commitment to quality. This comprehensive workshop service manual provides in-depth information for the DT125R, covering all essential maintenance, repair, and diagnostic procedures. It details the engine, fuel system, transmission, clutch, suspension, brakes, and electrical system, along with frame and bodywork. Included are routine maintenance schedules, step-by-step repair instructions, troubleshooting guides, and detailed wiring diagrams, making it an indispensable resource for professional technicians and dedicated DIY enthusiasts alike. 🏷️ Basic Information Identification Make: Yamaha Model: DT125 Model Variant: DT125R Year Range Covered: 1988-2002 Codes Vin Code Start Year: 1988 Vin Code End Year: 2002 👋 Introduction Market Position Target Audience: Professional technicians and advanced DIY enthusiasts. Historical Context: The DT125R falls into the category of lightweight, off-road capable dual-sport motorcycles, popular for trail riding, light commuting, and general recreational use during its production era. Competitive Analysis Manual Advantage: Comprehensive coverage for an extended model range, instant PDF download. Key Features Delivery Method: Instant Download, no shipping costs or waiting. Content Source: Original Factory Service Manual, containing accurate and complete information. Usability: Printable sections for workshop use, easy to navigate and understand. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Manual / Repair Manual Language: English Format: PDF Download Page Count Estimated Page Count: Hundreds (typical for comprehensive factory service manuals) 📖 Manual Coverage Systems Covered Engine: Complete overhaul, disassembly, assembly, tuning, lubrication, cooling system. Fuel System: Carburetor tuning and overhaul, fuel tank, fuel lines, fuel pump (if applicable). Transmission: Gearbox disassembly, assembly, inspection, maintenance, oil specifications. Clutch: Clutch operation, adjustment, inspection, replacement. Suspension: Front fork overhaul, rear shock absorber servicing, linkage maintenance. Brakes: Front and rear brake system service, hydraulic components, pad replacement, bleeding. Electrical System: Ignition system, lighting, battery, charging system, wiring diagrams. Cooling System: Air cooling system checks and maintenance. Frame And Bodywork: Frame inspection, body panel removal and installation, seat, handlebars. Wheels And Tires: Wheel bearing service, tire pressure, rim maintenance. Exhaust System: Exhaust pipe and silencer maintenance, repacking. Chassis: Frame integrity checks, steering head bearing maintenance. Procedures Included Routine Maintenance: Periodic maintenance charts, lubrication, chain adjustment, filter replacement. Repair Instructions: Step-by-step repair procedures for all major components. Troubleshooting: Diagnostic information and common problem solutions. Overhaul Procedures: Detailed instructions for complete engine and component rebuilds. Wiring Diagrams: Comprehensive electrical system wiring schematics. Diagnostic Guides: Troubleshooting tables and diagnostic flowcharts for common issues. Technical Depth Depth Level: Professional technician level, suitable for DIY mechanics. 📊 Manual Specifications File Format File Format: PDF Print Quality Printable: Yes Zoom Functionality: Yes Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Compatibility Operating Systems: Compatible with all versions of Windows & Mac. Requirements Software Requirements: Adobe PDF Reader & WinRAR. ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, single-cylinder, reed-valve induction Displacement: 124cc Bore X Stroke: 56.4 mm x 50.0 mm (typical for this era DT125) Compression Ratio: Approximately 7.1:1 (can vary by specific model/tuning) Performance Horsepower: Approx. 17-20 HP (varies by market and tuning, peak power typically around 7500-8000 RPM) Torque: Approx. 1.5-1.7 kgf-m (around 14-17 Nm) at 6500-7000 RPM Fuel System Carburetor Type: Mikuni VM28SS or similar (specific model may vary slightly) Fuel Type: Unleaded gasoline (minimum 91 RON recommended) Oil Mixture: Pre-mix 2-stroke oil in fuel or Autolube system (check manual for specific ratio/system) Ignition Ignition System: CDI (Capacitor Discharge Ignition) Engine Features Power Valve System: Yamaha Power Valve System (YPVS) for improved low-end torque and top-end power delivery (on many models). 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Clutch Type: Wet, multi-plate Optional Optional Transmission: N/A Features Final Drive: Chain drive 📐 Dimensions Exterior Length: Approx. 2130 mm Width: Approx. 825 mm Height: Approx. 1180 mm Wheelbase: Approx. 1390 mm Weights Dry Weight: Approx. 110-115 kg (varies slightly by model year) Fuel Tank Capacity: Approx. 10.0 Liters 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycle - individual country regulations apply) Active Features Front Brake: Disc brake Rear Brake: Drum brake (some later models may have disc) Passive Features Lighting: Headlight, taillight, brake light, turn signals. 💡 Technology Features Infotainment Infotainment System: N/A (Basic instrumentation: speedometer, odometer, neutral indicator, high-beam indicator). Driver Assistance Driver Assistance Features: N/A Connectivity Connectivity Options: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual; typically every 2000-3000 km or annually for transmission oil. Spark Plug Replacement: Refer to manual; typically every 3000-5000 km. Air Filter Cleaning: Regular checks, clean/replace every 2000-4000 km depending on usage. Fluid Specifications Transmission Oil: Yamalube Gear Oil 10W-30...