🏷️ Basic Information Identification Make: Yamaha Model: DT 125 R Vehicle Type: Dual-sport Motorcycle Generation Production Years Covered By Manual: 1988-2002 Codes Chassis Code Range Likely: 3JT, 4BL, 4ES, 4FW, 4GB, 4GD (Specific codes may vary by market and sub-model) 👋 Introduction Market Position Positioning: The Yamaha DT 125 R has historically been a popular choice for off-road riding, trail use, and lightweight adventure, appealing to riders seeking robust performance and reliability in a versatile package. Competitive Analysis Competitors: Competed with similar displacement dual-sport motorcycles from brands like Honda (e.g., CRM series), Kawasaki (e.g., KDX series), and Suzuki (e.g., DR series) during its production run. Key Features Distinctive Features: Known for its torquey two-stroke engine, strong off-road capability, reliable Monocross suspension, and durable construction, making it a favorite for enthusiasts and a practical choice for utility. 📋 Manual Details Coverage Areas Manual Scope: Comprehensive repair and overhaul for Yamaha DT 125 R models from 1988 to 2002. Page Count Total Pages: 154 Manual Type Type: Workshop Service Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine And Transmission: Detailed disassembly, assembly, repair, and overhaul procedures for the engine and transmission systems. This includes specialized aspects of Yamaha's two-stroke engine technology. Fuel System: Comprehensive coverage of the fuel system, including carburetor tuning, maintenance, and component repair. Information on proprietary fuel system components is also included. Ignition System: Detailed procedures for ignition system maintenance, troubleshooting, and repair, covering components like the CDI, stator, and spark plug. Lubrication System: Information on the lubrication system, essential for two-stroke engines, including oil mixing ratios and maintenance procedures. Exhaust System: Guidance on the exhaust system, including maintenance and potential modifications or repairs. Electrical System: Extensive coverage of the motorcycle's electrical system, including wiring diagrams, lighting, charging system, and troubleshooting for electrical faults. Bodywork And Frame: Procedures for the removal, installation, and repair of body panels, fairings, and chassis components. This also includes seating and fuel tank maintenance. Suspension And Steering: Maintenance and repair procedures for front forks (e.g., telescopic forks with Monocross rear suspension), rear shock absorbers, and steering components. Braking System: Details on brake system maintenance, including hydraulic systems (disc brakes front and rear), pad replacement, fluid bleeding, and caliper service. Wheels And Tires: Information on wheel bearing maintenance, tire selection, pressure recommendations, and tire changing procedures. Procedures Included Routine Maintenance: Complete guidance on routine maintenance tasks, including fluid changes, filter replacements, chain adjustment, and lubrication schedules. Tune Ups: Detailed procedures for performing tune-ups, ensuring optimal engine performance and fuel efficiency. Diagnostics And Troubleshooting: Procedures for diagnosing and resolving common issues and malfunctions across all vehicle systems. Component Removal And Installation: Step-by-step instructions for the removal and installation of major and minor components. Engine Rebuilds: Comprehensive instructions for complete engine disassembly, inspection, repair, and reassembly, including critical torque specifications. Transmission Overhaul: Detailed procedures for transmission disassembly, inspection, component replacement, and reassembly. Technical Depth Depth: This manual provides in-depth technical information, assuming a technician is conversant with general automotive practices. It focuses on the specialized aspects of the Yamaha DT 125 R, enabling professional-level repairs and maintenance. 📊 Manual Specifications File Format Quality: PDF format, designed for clear readability and printing. Print Quality Printable: Yes Binding Type Binding: Digital (PDF download) Paper Type Delivery Method: Electronic delivery via email ⚙️ Engine Specifications Primary Engine Type: 2-stroke, liquid-cooled, reed valve inducted, single-cylinder Displacement: 123cc (approximate, may vary slightly by sub-model) Bore X Stroke: Approx. 56.8 mm x 49.8 mm Compression Ratio: Typically around 7.2:1 or higher (varies by year/market) Power Output Estimated: Approximately 18-25 HP (varies significantly by market emissions and tuning) Torque Output Estimated: Around 1.5-2.0 kgf-m (14.7-19.6 Nm) Performance Carburetor Type: Mikuni VM series (e.g., VM28 or similar) Ignition Type: CDI (Capacitor Discharge Ignition) Fuel System Fuel Delivery: Carburetor with premix or oil injection system Fuel Type Recommendation: Unleaded gasoline (Octane rating will be specified in manual) Engine Oil 2 Stroke Oil Type: Yamalube 2-stroke oil or equivalent high-quality 2-stroke pre-mix/injection oil Transmission Oil Type: Yamalube Gear Oil or equivalent SAE 80W API GL-4 Transmission Oil Capacity: Approx. 0.85 Liters 🔧 Transmission Standard Type: 6-speed constant mesh Optional Clutch Type: Wet, multi-plate Features Gear Ratios: Specific gear ratios are detailed within the manual for each gear. 📐 Dimensions Exterior Length: Varies by specific model year, typically around 2170 mm Width: Varies by specific model year, typically around 820 mm Height: Varies by specific model year, typically around 1155 mm Wheelbase: Approximately 1410 mm Weights Dry Weight: Approx. 114 kg (varies by specific model year) Wet Weight Estimated: Approx. 125 kg (including fluids) Fuel Capacity: Approximately 10 Liters (including reserve) 🛡️ Safety Features Ratings Safety Standards: Meets relevant safety standards for motorcycles of its era. Specific crash test ratings are not typically applicable to this type of vehicle in the same...