🏷️ Basic Information Identification Make: Yamaha Model: DT125 Model Variant: DT125R Year: 1987-1988 Codes Vin Decoder Reference: Refer to manual for VIN specifics 👋 Introduction Market Position Target Audience: Yamaha DT125R owners and independent repair shops seeking comprehensive, factory-authorized service information. Competitive Analysis Value Proposition: Provides the same in-depth technical knowledge as professionals, enabling informed maintenance, repair, and cost savings. Key Features Format Advantage: Digital PDF format allows for easy searching, printing of specific pages, and avoidance of physical manual wear and tear. Content Quality: Includes hundreds of pages with detailed illustrations, diagrams, photos, and specifications. 📋 Manual Details Coverage Areas Covered Models: Yamaha DT125R (all styles covered) Covered Years: 1987, 1988 Page Count Estimated Pages: Hundreds Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: General Information, Engine Top End, Engine Lubrication System, Crankshaft/Transmission Fuel System: Fuel System Cooling System: Cooling System Drivetrain: Clutch, Engine Removal/Installation, Crankshaft/Transmission, Final Drive Chassis: Wheels/Tires, Brakes, Suspension, Steering, Frame Electrical: Electrical System, Wiring Diagrams Miscellaneous: Appendix Procedures Included Maintenance: Routine maintenance, fluid checks, component lubrication Troubleshooting: Engine fault symptom diagnosis, advanced troubleshooting guide Repair: Step-by-step repair procedures for all covered systems, component replacement Diagnostics: Engine management system analysis, electrical system diagnostics, part testing techniques Rebuild: Complete engine rebuild, transmission overhaul Technical Advice: Mechanic tips, advice for owners on interacting with service professionals Technical Depth Depth: Comprehensive factory-level detail for professional technicians and advanced DIY mechanics. 📊 Manual Specifications File Format Format: PDF Compatibility: Windows, macOS, Linux (requires Adobe PDF Reader) Print Quality Printability: Printable without restriction (individual pages or entire manual) Resolution: High quality, suitable for clear printing of diagrams and text. Binding Type Binding: Digital Download (user printable, can be bound or stored electronically) Paper Type Paper Type Recommendation: Standard copy paper for printing, heavier stock recommended for frequently referenced sections. ⚙️ Engine Specifications Primary Engine Type: 2-stroke, single-cylinder, reed valve induction Displacement: 124 cc (approximately) Bore X Stroke: Refer to manual for precise specifications Cooling: Liquid-cooled (typically with a radiator) Performance Horsepower: Refer to manual for specific model year output (typically around 15-20 HP) Torque: Refer to manual for specific model year output Fuel System Carburetor Type: Mikuni VM series (specific model number in manual) Fuel Type: Unleaded gasoline (refer to manual for octane rating) Fuel Mixture: 2-stroke oil/gasoline mix (specific ratio and oil type in manual) 🔧 Transmission Standard Type: 6-speed constant mesh, return shift Features Clutch: Wet, multi-plate Gear Ratios: Detailed in manual Transmission Oil: Yamalube (specific grade and capacity in manual) 📐 Dimensions Exterior Overall Length: Refer to manual Overall Width: Refer to manual Overall Height: Refer to manual Weights Dry Weight: Refer to manual (typically around 110-120 kg) Wet Weight: Refer to manual 🛡️ Safety Features Ratings Safety Certification: Refer to regional homologation documents Active Features Braking System: Front: Disc brake; Rear: Drum brake (or Disc on some R models - verify with manual) Suspension Front: Telescopic fork Suspension Rear: Monocross suspension 💡 Technology Features Infotainment Features: Basic analog instrument cluster (speedometer, tachometer, odometer, indicators). Driver Assistance Features: None Connectivity Features: None 🔧 Maintenance Service Intervals Oil Change Transmission: Refer to manual for specific mileage/time intervals (e.g., every 3000-5000 km) Spark Plug Check Replace: Refer to manual (typically every 1000-2000 km) Air Filter Cleaning: Refer to manual (frequency dependent on operating conditions) Fluid Specifications Engine Oil Mix: Yamalube 2-stroke oil or equivalent (100% synthetic recommended) at specified ratio (e.g., 20:1 or 30:1) Transmission Oil: Yamalube Gear Oil (GL-4 80W or 90W) or equivalent Coolant: Ethylene glycol-based antifreeze/coolant (50% mixture with distilled water) Known Issues Common Wear Items: Piston rings, clutch plates, exhaust packing, bearings (e.g., swingarm, wheel, steering stem) Carburetion Issues: Clogged jets, worn needle/seat due to fuel quality or age Power Valve Operation: Carbon buildup affecting operation, requiring cleaning Technical Specifications Ignition Timing: Refer to manual (critical for 2-stroke performance) Valve Clearance: N/A (2-stroke engine) 📚 Vehicle History Brand Heritage Heritage: Yamaha's long history in off-road and dual-sport motorcycles, known for reliable and capable two-stroke engines. Model Evolution Evolution: The DT series has a lineage dating back to the 1960s, evolving into more performance-oriented and off-road capable models like the DT125R. Production Manufacturing Era: Late 1980s, a period of refinement for Japanese dual-sport motorcycles. 🏆 Awards & Recognition Recognitions Model Specific Awards: The DT series was well-regarded in its era for its performance and off-road capability, contributing to Yamaha's reputation in dual-sport.