The Yamaha DT100, a lightweight dual-sport motorcycle produced from 1974 through 1983, represents Yamaha's commitment to accessible performance and reliability for trail riding and general utility. This model, part of the esteemed DT series, was designed with a focus on simplicity and rugged capability, making it a popular choice for off-road enthusiasts and everyday riders alike. Its 97cc two-stroke, air-cooled engine and six-speed transmission provided a capable platform for diverse terrain, embodying Yamaha's engineering prowess in the dual-sport segment. This comprehensive service repair workshop manual provides detailed information for the maintenance, repair, and troubleshooting of the Yamaha DT100 motorcycle. It covers all major systems, including engine, transmission, chassis, and electrical components, with step-by-step instructions for disassembly, reassembly, and adjustments. The manual is an essential resource for owners and technicians, offering guidance on scheduled maintenance, diagnosing common issues, and performing in-depth repairs, ensuring the longevity and optimal performance of the vehicle. 🏷️ Basic Information Identification Make: Yamaha Model: DT 100 Sub Model: Trail-Bike Model Years Covered: 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983 Codes Chassis Code General: DT100 (specific codes may vary by year/market) 👋 Introduction Market Position Segment: Lightweight dual-sport motorcycle Target Audience: Off-road enthusiasts, commuters, general utility riders seeking an affordable and capable machine. Competitive Analysis Key Competitors: Honda CR125 Elsinore, Kawasaki KE100, Suzuki TS100, Hodaka Wombat. Key Features Design Philosophy: Yamaha's focus on reliability, simplicity, and accessible performance for trail riding and light off-road use. Manual Value Proposition: Empowers owners to perform maintenance and repairs themselves, saving money and extending the life of their vintage Yamaha. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive service, repair, maintenance, and troubleshooting for the Yamaha DT100 motorcycle range from 1974-1983. Page Count Estimated Page Count: Information not explicitly provided, but described as 'detailed' and 'highly detailed'. Manual Type Manual Type: Service Repair Workshop Manual / Factory Manual / Repair Guide Language Language: English Format Digital Format: PDF (potentially zipped, requiring WinZip/WinRAR for extraction) 📖 Manual Coverage Systems Covered Engine: Engine overhaul, assembly, disassembly, specifications, lubrication, cooling system (air-cooled), ignition system, carburetor adjustment. Transmission: Gearbox, clutch operation, assembly, disassembly, gear ratios, lubrication, maintenance. Chassis And Frame: Frame inspection, repair, suspension (front forks, rear shocks), steering system, wheel alignment, bearings. Electrical System: Lighting system, ignition system (CDI, points, etc.), battery maintenance, wiring diagrams, troubleshooting electrical faults, generator/alternator, starter (if applicable). Fuel System: Fuel tank, fuel lines, fuel petcock, carburetor service and tuning (e.g., Mikuni VM series), fuel filter. Brakes: Front and rear brake systems (drum or disc depending on year/variant), brake fluid, brake shoe/pad replacement, brake cable adjustment, hydraulic system maintenance (if applicable). Lubrication: Engine oil, gearbox oil, chain lubrication, chassis lubrication points, oil change intervals, oil specifications. Bodywork And Trim: Fenders, side covers, seat removal and maintenance, tank removal, handlebar components. Locks And Security: Ignition lock, steering lock maintenance. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, chain adjustment, spark plug service, brake adjustments, tire pressure checks. Troubleshooting: Diagnostic procedures for common issues, problem-solving guides for starting problems, running issues, electrical faults, braking problems. Repair And Rebuild: Complete step-by-step instructions for engine rebuilds, transmission overhauls, suspension repairs, brake system servicing, electrical component replacement. Restoration: Detailed guidance for restoring components and the overall motorcycle. Technical Depth Depth Of Information: Highly detailed, suitable for professional technicians and DIY enthusiasts. Covers complete disassembly, repair, and reassembly of all major components. 📊 Manual Specifications File Format File Type: PDF Compatibility: Windows (97, 2000, Me, XP, Vista, 7, 10), Linux, Mac Extract Software: WinZip or WinRAR recommended for zipped files Print Quality Printability: Printable on any computer Binding Type Binding: Digital Download (not a physical copy, no CD/DVD) Paper Type Paper Quality: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, air-cooled, single cylinder Displacement: 97 cc (for most models, slight variations may exist) Bore X Stroke: Approx. 52.0 mm x 45.0 mm (check specific year for exact figures) Compression Ratio: Typically around 6.5:1 to 7.0:1 (check specific year) Induction: Carburetor (e.g., Mikuni VM24SS or similar) Performance Horsepower: Approximately 10-12 HP at ~6,000-7,000 RPM (varies by year and tuning) Torque: Approx. 9-10 Nm at ~5,000-6,000 RPM (varies by year) Fuel System Fuel Type: Unleaded gasoline with 2-stroke oil premix (ratio typically 20:1 or 32:1, consult manual for exact specification) Fuel Tank Capacity: Approximately 6.0 - 8.0 liters (depending on year and specific model variant) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh manual transmission Clutch Type: Wet, multiple-disc Features Gear Ratios: Specific gear ratios are detailed within the manual, crucial for performance tuning and understanding operation. Final Drive: Chain drive 📐 Dimensions Exterior Overall Length: Approx. 1970 mm (varies by year) Overall Width: Approx. 850 mm (varies by year) Overall Height: Approx. 1155 mm (varies by year) Wheelbase: Approx. 1305 mm (varies by year) Weights Dry Weight: Approximately 90-100 kg (varies by...