🏷️ Basic Information Identification Make: Yamaha Model: DT125R Year: 1988 Vehicle Type: Dual-Sport Motorcycle 👋 Introduction Market Position Market Segment: Entry-level to intermediate dual-sport motorcycle, popular for trail riding, light off-roading, and commuting. Competitive Analysis Competitors 1988: Honda XL series, Kawasaki KLR250, Suzuki DR200/DR250. Key Features Durability: Yamaha's reputation for robust two-stroke engines and reliable chassis components. Off Road Capability: Designed with off-road prowess featuring long-travel suspension and durable construction. Simplicity: Relatively simple mechanical design for ease of maintenance and repair. 📋 Manual Details Coverage Areas Coverage Summary: Comprehensive factory service and repair for Yamaha DT125R 1988 model. Page Count Estimated Pages: Hundreds (specific count not provided, but described as complete). Manual Type Type: Factory Service Repair Manual Language Language: English (assumed based on typical factory manuals for international markets). Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: Complete engine disassembly, assembly, tuning, troubleshooting, and repair for the 125cc two-stroke engine. Fuel System: Carburetor (Mikuni VM series likely) disassembly, cleaning, adjustment, and troubleshooting; fuel tank and petcock inspection and repair. Ignition System: CDI ignition system, spark plug selection and gap, coil testing, timing procedures. Transmission: Six-speed gearbox overhaul, clutch adjustment and replacement, gearshift mechanism. Suspension: Front telescopic forks (likely KYB or similar) service, oil change, seal replacement, damping adjustment; rear Monoshock suspension (Monocross system) rebuild and adjustment. Brakes: Front and rear drum brakes (typical for this era and model) inspection, adjustment, and relining; hydraulic disc brake service if applicable to specific regional variants (though less likely for base 1988 R model). Electrical System: Wiring diagrams, lighting system, charging system (stator, regulator/rectifier), battery maintenance, starter motor (if electric start equipped), horn, indicators. Cooling System: Air-cooled engine specifications and maintenance. Exhaust System: Expansion chamber maintenance, mufflers, and performance tuning considerations. Frame And Bodywork: Chassis inspection, steering head bearing service, body panel removal and installation, seat maintenance. Procedures Included Routine Maintenance: Oil changes, filter replacements (air, spark plug), chain adjustment, lubrication points. Troubleshooting: Diagnostic procedures for common performance issues, starting problems, electrical faults. Repair Procedures: Step-by-step guides for major component overhauls and component replacements. Specifications Charts: Torque specifications, clearances, fluid capacities, electrical resistance values. Wiring Diagrams: Detailed, color-coded wiring diagrams for electrical system diagnostics and repair. Special Tools: Identification and usage of specialized tools required for certain procedures. Technical Depth Depth: Full factory level, covering everything from basic maintenance to complete engine and chassis rebuilds. 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Print Quality Quality: High-resolution scans of original factory documentation, allowing for clear printing of text and diagrams. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Searchability Text Search: Likely text-searchable if OCR was applied during PDF creation, enhancing ease of navigation. Printability Printable: Yes, pages can be printed individually or in full as needed. ⚙️ Engine Specifications Primary Engine Engine Type: 123cc liquid-cooled, 2-stroke, reed valve inducted, single-cylinder. Bore X Stroke: 56.0 mm x 50.0 mm (typical for DT125R). Compression Ratio: Approx. 7.2:1 (varies with tuning). Power Output Hp: Approx. 22-25 HP @ 8000 RPM (typical for 1988 model, varies by region). Torque Lb-Ft: Approx. 15-17 lb-ft @ 7000 RPM (typical). Performance Top Speed Mph: 70-75 mph (estimated). Fuel System Carburetor Model: Mikuni VM28SS (likely, standard fitment). Fuel Type: Unleaded gasoline, minimum 87 octane (Octane rating may vary based on regional fuel standards). Fuel Mixture: Pre-mix gasoline and 2-stroke oil (ratio typically 50:1 or 100:1 depending on oil quality and manufacturer recommendation). 🔧 Transmission Standard Type: Constant mesh, 6-speed sequential return. Clutch Type: Wet, multiple disc. Features Gear Ratios: Specific ratios available in the manual, crucial for performance tuning. Final Drive: O-ring sealed chain drive (specific sprocket sizes will be detailed). 📐 Dimensions Exterior Length: Approx. 2170 mm (85.4 in). Width: Approx. 810 mm (31.9 in). Height: Approx. 1155 mm (45.5 in). Wheelbase: Approx. 1420 mm (55.9 in). Weights Dry Weight: Approx. 115 kg (253.5 lbs). Wet Weight: Approx. 123 kg (271.2 lbs) (with fluids). Fuel Capacity: 10.0 Liters (2.6 US gallons). 🛡️ Safety Features Ratings Crash Safety Rating: N/A (Motorcycle safety ratings are not standardized like automotive). Active Features Braking System: Front drum brake, Rear drum brake. Manual will detail adjustment and maintenance. Lighting: Headlight, taillight, brake light, turn signals. Manual covers electrical diagnostics. Passive Features Frame Construction: Steel backbone frame designed for durability and off-road resilience. Tire Type: Dual-purpose knobby tires suitable for on-road and off-road use. Manual will specify recommended sizes and pressures. 💡 Technology Features Infotainment Features: N/A (This is a 1988 model motorcycle, focusing on mechanical and electrical systems rather than modern infotainment). Driver Assistance Features: N/A (No electronic driver assistance systems on this model). Connectivity Features: N/A (No modern connectivity features). Engine Management Ypvs: Yamaha Power Valve System (YPVS) for improved power delivery across the RPM range. Manual provides detailed information on its operation and...