🏷️ Basic Information Identification Make: Yamaha Model: TW125 Year: 1999 Market Segment: Dual-Sport/Trail Motorcycle Codes Chassis Code: Likely 5FL or similar Yamaha internal code 👋 Introduction Market Position Vehicle Class: Lightweight dual-sport motorcycle known for its simplicity, ease of use, and off-road capability, particularly favored for trail riding and light adventure. Competitive Analysis Competitors: Competed with other 125cc dual-sport motorcycles from manufacturers like Honda (e.g., XR125), Suzuki (e.g., DR125), and Kawasaki (e.g., KLR125) of the era. Key Features Unique Selling Points: Fat tires (hence 'TW'), which provide exceptional traction and comfort on varied terrain, simple air-cooled engine, robust construction. Manual Value Proposition Target Audience: Professional motorcycle technicians, independent repair shops, and ambitious DIY owners seeking to maintain or restore their 1999 Yamaha TW125. 📋 Manual Details Coverage Areas Geographical Coverage: Global (likely focused on markets where TW125 was officially sold, e.g., Europe, Japan) Page Count Estimated Page Count: Hundreds of pages (as stated in product description) Manual Type Manual Type: Workshop Service Manual / Repair Manual Language Language: English Format Digital Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Detailed overhaul, tuning, troubleshooting of the 125cc engine. Transmission: Clutch, gearbox, final drive maintenance and repair. Fuel System: Carburetor (likely Mikuni VM series), fuel lines, fuel tank inspection and service. Ignition System: CDI unit, ignition coil, spark plug, timing checks. Electrical System: Wiring diagrams, lighting, battery, charging system (stator, regulator/rectifier), starting system. Suspension: Front telescopic forks (oil change, seal replacement) and rear monoshock absorber (adjustment, overhaul). Braking System: Front and rear drum or disc brakes (depending on specific market variant), hydraulic components, pad/shoe replacement, fluid. Chassis And Frame: Frame inspection, steering head bearings, swingarm bearings. Bodywork And Trim: Fenders, seat, fuel tank removal and installation, minor body panel repairs. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, lubrication, tire pressure checks. Troubleshooting: Systematic diagnostic procedures for common and uncommon faults. Engine Rebuild: Complete engine disassembly, inspection, part replacement, and reassembly. Carburetor Overhaul: Jet cleaning, float level adjustment, mixture screw settings. Electrical Diagnostics: Using wiring diagrams to trace faults, testing components. Suspension Service: Fork seal replacement, fork oil viscosity and level specifications. Brake System Maintenance: Bleeding procedures, inspection of brake components. Technical Depth Depth Of Information: Comprehensive, suitable for professional technicians and advanced DIY mechanics. Diagnostic Capability: Advanced diagnostic flowcharts and troubleshooting trees. Rebuild Information: Detailed overhaul procedures for major components including engine, transmission, and suspension. 📊 Manual Specifications File Format File Format: PDF Print Quality Printability: Full Printable Zoom Capability: YES Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Software Requirements PDF Reader: Adobe PDF Reader Compression Utility: WinRAR Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, SOHC, single-cylinder Displacement: 124 cc Bore X Stroke: 54 mm x 54 mm (Typical for this era Yamaha 125cc) Compression Ratio: Likely around 9.5:1 to 10.5:1 Performance Horsepower: Approximately 10-12 HP (actual figures vary by market and tuning) Torque: Approximately 9-10 Nm (actual figures vary by market and tuning) Fuel System Carburetor Type: Mikuni VM Series (e.g., VM20 or VM22), single carburetor Fuel Capacity: Approximately 9 Liters (including reserve) Lubrication Oil Type: API SE, SF, SG, SH or higher, SAE 10W-40 recommended (check manual for exact specification) Oil Capacity: Approximately 1.0-1.2 Liters (with oil filter change) 🔧 Transmission Standard Transmission Type: 5-speed constant mesh Clutch Type: Wet, multiple-disc Final Drive: Chain drive Features Gear Ratios: Specific ratios detailed in the manual, designed for tractable off-road power delivery. Transmission Oil Type: Yamalube 4 (or equivalent) SAE 10W-40, API SE, SF, SG, SH or higher 📐 Dimensions Exterior Overall Length: Approx. 2055 mm Overall Width: Approx. 820 mm Overall Height: Approx. 1115 mm Seat Height: Approx. 800 mm Weights Dry Weight: Approx. 110-115 kg Wet Weight: Approx. 117-122 kg Wheels Tires Front Tire Size: 130/80-18 (distinctive fat tire) Rear Tire Size: 180/80-14 (distinctive fat tire) 🛡️ Safety Features Ratings Safety Standards: Complies with relevant local motorcycle safety and emissions standards of the time. Active Features Lighting: Headlight, taillight, brake lights, turn signals. Passive Features Frame Design: Steel cradle frame providing good stability and durability for trail use. 💡 Technology Features Infotainment Infotainment System: N/A (Basic motorcycle instrumentation: speedometer, odometer, neutral indicator, high beam indicator). Driver Assistance Driver Assistance Features: N/A (No electronic rider aids typical for this era and class of motorcycle). Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 km or 6 months (refer to manual for precise recommendations) Air Filter Cleaning: Every 2,000 km or 12 months Spark Plug Replacement: Every 10,000 km Fluid Specifications Fork Oil Viscosity: Yamaha Fork Oil 10W or equivalent (check manual for capacity) Brake Fluid: DOT 3 or DOT 4 (check manual for specific recommendation and bleeding procedure) Known Issues Common Wear Items: Tire wear...