This manual covers the DT125R, a robust dual-sport motorcycle produced for the 1987 and 1988 model years. Representing the third generation of the esteemed DT125R lineage, this machine is engineered for versatility, offering capable performance both on and off paved roads. The legacy of building reliable and performance-oriented motorcycles is evident in the DT125R, known for its durable 2-stroke engine and agile handling, making it a popular choice for adventure and everyday riding. This comprehensive service repair workshop manual is designed to provide detailed guidance for the maintenance and repair of your 1987-1988 DT125R. It covers a wide array of essential topics, including engine specifications, drivetrain, chassis, and electrical systems. Within its pages, you will find step-by-step instructions for basic maintenance, intermediate repairs, and advanced diagnostics, along with crucial troubleshooting information and wiring diagrams. This manual is an indispensable resource for owners and technicians alike, ensuring the longevity and optimal performance of the vehicle through accurate and accessible technical information. 🏷️ Basic Information Identification Make: Yamaha Model: DT125R Year: 1987, 1988 Codes Engine Code: Likely 1G8 or similar for this generation DT125R (specific code not explicitly stated in product info) Generation Model Generation: Third Generation DT125R (based on model years) 👋 Introduction Market Position Target Audience: Owners of Yamaha DT125R (1987-1988), independent mechanics, enthusiasts seeking to maintain or repair their motorcycle. Competitive Analysis Value Proposition: Provides dealership-level repair information, enabling significant cost savings on maintenance and repairs. Key Features Unique Selling Points: Vehicle-specific, accurate, clear, concise text with diagrams/illustrations, wiring schematics, step-by-step instructions, advanced troubleshooting. Accessibility: Downloadable PDF format for easy access on multiple devices. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Workshop Scope: Comprehensive for 1987-1988 Yamaha DT125R models Page Count Estimated Page Count: Varies by specific manual version, but likely extensive due to detail level. Typical service manuals for this era are 200-500+ pages. Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Engine Specifications, Engine Removal and Installation, Fuel System, Intake & Exhaust Drivetrain: Transmission, Drive Chain, Sprockets Chassis: Steering System, Shocks, Body Work Electrical: Electrical System, Wiring Diagram Maintenance: Routine Maintenance, Periodic Checks and Adjustments, Lubrication, Cooling System Procedures Included Basic Maintenance: Oil changes, spark plug replacement, air filter cleaning/replacement, chain adjustment, brake adjustments. Intermediate Repair: Engine tune-ups, carburetor cleaning and adjustment, clutch service, brake system servicing, suspension component replacement. Advanced Repair: Engine disassembly and reassembly, transmission overhaul, electrical system diagnostics and repair, chassis component replacement. Troubleshooting: Advanced Troubleshooting, diagnostics for common and uncommon issues. Technical Depth Depth: Comprehensive, suitable for both amateur mechanics and professional technicians. Diagnostic Tools: Includes information implicitly suggesting use of standard motorcycle diagnostic tools and torque wrenches. 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Yes, individual pages are printable. Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Quality: N/A (Digital PDF format) Compatibility Operating Systems: All Versions of Windows AND Mac Requirements Software Requirements: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, liquid-cooled, reed valve induction (typical for DT125R of this era) Displacement: 123 cc (approximately) Bore X Stroke: Specifics available within the manual, typically around 56.5 mm x 49.8 mm Compression Ratio: Specifics available within the manual, likely around 7.2:1 or higher Performance Horsepower: Typically around 15-20 HP depending on specific market regulations. Exact figures in manual. Torque: Specific figures available within the manual. Fuel System Carburetor Type: Likely a single Mikuni VM series carburetor. Specific model (e.g., VM28) in manual. Fuel Type: Unleaded gasoline (minimum octane rating to be specified in manual). Fuel Mixture: Pre-mix (gasoline and 2-stroke oil) or Oil Injection system (specifics in manual). 🔧 Transmission Standard Transmission Type: 6-speed constant mesh, sequential. Optional Optional Transmission: N/A Features Clutch Type: Wet, multiple disc. Gear Ratios: Detailed gear ratios for each speed are provided in the manual. Transmission Oil Type: Specific Yamaha recommended oil or equivalent Yamalube 2-stroke oil type and capacity detailed in manual. 📐 Dimensions Exterior Overall Length: Specifics available in manual, but typical for a dual-sport of this era. Overall Width: Specifics available in manual. Overall Height: Specifics available in manual. Wheelbase: Specifics available in manual, typically around 1390 mm (54.7 in). Weights Dry Weight: Specifics available in manual, typically around 110-115 kg (242-253 lbs). Wet Weight: Specifics available in manual (includes all fluids). Fuel Capacity: Specifics available in manual, typically around 10 liters (2.6 US gal). 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycle safety ratings are not typically standardized like automotive crash tests). Active Features Braking System: Front disc brake, rear drum brake (typical for this model year). Specifications in manual. Suspension Type: Telescopic front fork, Monocross rear suspension. Adjustment and maintenance procedures in manual. 💡 Technology Features Infotainment Infotainment System: N/A (This is a 1980s dual-sport motorcycle, no advanced infotainment...