🏷️ Basic Information Identification Make: Yamaha Model: DT125R Year: 1987-1988 Vehicle Type: Dual-Sport Motorcycle Generation Generation Code: 34X / 4ES 👋 Introduction Market Position Market Segment: Entry-level to mid-range dual-sport motorcycles, popular for off-road riding and light trail use. Competitive Analysis Key Competitors: Honda CR125R, Kawasaki KDX125, Suzuki RM125, KTM 125 EXC of similar eras. Key Features Vehicle Appeal: Known for its lightweight, agile handling, reliable two-stroke engine, and versatility for both on- and off-road use. Manual Value Cost Effectiveness: Inexpensive way to maintain and repair the vehicle compared to professional shop rates. User Base: Targeted at both DIY enthusiasts and professional mechanics seeking detailed repair information. 📋 Manual Details Coverage Areas Manual Title: Yamaha DT125 DT125R 1987-1988 Workshop Service Repair Manual PDF Download Covered Models: Yamaha DT125R Covered Years: 1987, 1988 Page Count Estimated Page Count: 300+ Manual Type Manual Type: Workshop Service Repair Manual / Factory Service Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Full coverage including disassembly, inspection, repair, and reassembly of engine components. Engine Electrical: Comprehensive details on ignition system, charging system, lighting, and starter motor. Emission Control: Specific information related to emission control systems for the applicable model years. Fuel System: Detailed coverage of carburetor system, fuel tank, fuel lines, and fuel pump operation. Suspension System: Front fork and rear monoshock suspension servicing, adjustments, and overhaul procedures. Clutch System: Maintenance, adjustment, and repair of the clutch assembly and actuation mechanism. Transmission: Coverage of the 6-speed manual transaxle, including gear inspection, shift mechanism, and lubrication. Drivetrain: Information on the final drive chain and sprockets, including maintenance and replacement. Steering System: Handlebar, steering stem bearing, and fork alignment servicing. Brake System: Front and rear brake system maintenance, including hydraulic fluid, pad replacement, and caliper servicing. Body Interior Exterior: Fairings, fenders, seat, fuel tank, and other body panel removal, installation, and repair. Body Electrical: Wiring harnesses, switches, controls, lighting, and instrument cluster diagnostics. Restraint System: While primarily a motorcycle, this might refer to user safety recommendations or specific components if applicable. Procedures Included Preventive Maintenance: Detailed schedules and procedures for regular servicing, lubrication, and inspections. Troubleshooting: Systematic diagnostic guides for identifying and resolving common operational issues. Repair And Rebuild: Step-by-step instructions for component removal, overhaul, repair, and reinstallation. Electrical Diagnostics: Includes wiring diagrams and procedures for diagnosing electrical faults. Torque Specifications: Precise torque values for all critical fasteners and bolts. Special Tools: Identification of any specific tools required for certain maintenance or repair tasks. Technical Depth Depth Of Coverage: Comprehensive, suitable for both novice DIY enthusiasts and experienced mechanics. Diagnostic Capability: Extensive troubleshooting sections for diagnosing a wide range of mechanical and electrical issues. 📊 Manual Specifications File Format File Format: PDF Print Quality Printability: Fully printable, allowing users to print specific pages or the entire manual. Zoom Capability: Yes, allows for zooming in and out of illustrations and diagrams. Binding Type Delivery Method: Instant Download Paper Type Software Requirements: Adobe PDF Reader Compression Requirement: WinZip or similar archive utility Compatibility Operating Systems: Compatible with all versions of Windows and Mac OS ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, reed valve, liquid-cooled Displacement: 124cc Bore X Stroke: 56.4 mm x 50.0 mm Compression Ratio: 7.2:1 (typical) Performance Horsepower: Approx. 20-22 HP @ 8000 RPM (variant dependent) Torque: Approx. 16-18 Nm @ 7000 RPM (variant dependent) Fuel System Carburetor Model: Mikuni VM28SS (typical) Fuel Type: Unleaded gasoline with appropriate 2-stroke oil pre-mix or oil injection system. Lubrication Lubrication Type: Yamaha's Autolube system (oil injection) or manual pre-mix. 🔧 Transmission Standard Transmission Type: Constant mesh 6-speed sequential manual Clutch Type: Wet, multiple disc Features Gear Ratios: Specific gear ratios available within the manual. Final Drive: Chain drive 📐 Dimensions Exterior Overall Length: Varies by model year and specific configuration, detailed in manual. Weights Dry Weight: Approx. 110-120 kg (variant dependent) Fuel Tank Capacity: Approx. 10-12 Liters 🛡️ Safety Features Ratings Safety Focus: The manual details safe operating procedures, maintenance for reliable braking and handling. Active Features Braking System: Front: Disc brake; Rear: Drum brake or Disc brake (variant dependent). Passive Features Lighting System: Headlight, taillight, brake light, turn signals (where equipped). 💡 Technology Features Infotainment Instrumentation: Analog speedometer, tachometer, odometer, and indicator lights. Driver Assistance Rider Aids: None in the modern sense; focus is on mechanical simplicity and rider control. Connectivity Electrical System: 12V DC electrical system for ignition, lights, and charging. 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific recommendations based on usage, typically 3,000-5,000 km for gearbox oil. Spark Plug Maintenance: Regular inspection and replacement as per manual recommendations, crucial for 2-stroke performance. Fluid Specifications Gearbox Oil Type: Yamalube Gear Oil (or equivalent API GL-4, SAE 80W or 10W-30 transmission oil) - specific viscosity may vary. Coolant Type: Yamaha-specified coolant or a high-quality ethylene glycol-based...