🏷️ Basic Information Identification Make: Yamaha Model: DT125X Production Years Covered: 2002, 2003, 2004, 2005, 2006, 2007, 2008 👋 Introduction Market Position Segment: Lightweight Dual-Sport / Motocross Competitive Analysis Key Competitors Era: Honda CR125R, Kawasaki KX125, Suzuki RM125, KTM 125 EXC (during its production run). Key Features Vehicle Type: Two-stroke, off-road focused motorcycle with street legality in some configurations. Target Audience: Enthusiasts seeking a capable and relatively simple-to-maintain off-road machine, often for trail riding and recreational use. 📋 Manual Details Coverage Areas Primary Coverage: Factory Service Repair Page Count Estimated Pages: Hundreds (specific number not provided, but indicates substantial content) Manual Type Type: Official Factory Service Manual Language Language: English (implied by product description and common for Yamaha service manuals) Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine disassembly, inspection, repair, and reassembly procedures for all internal components. Engine Electrical: Ignition system, charging system, starting system, CDI unit, wiring diagrams, troubleshooting electrical faults. Fuel System: Carburetor specifications, adjustments, cleaning, fuel tank, fuel lines, fuel filter. Transmission Drivetrain: Clutch operation and adjustment, gearbox internal inspection and repair, chain drive maintenance. Suspension: Front fork (telescopic) overhaul, rear shock absorber inspection and replacement, linkage lubrication. Brakes: Front and rear brake system inspection, hydraulic fluid replacement, pad and caliper maintenance, bleeding procedures. Wheels Tires: Wheel bearing inspection and replacement, tire pressure specifications, wheel balance checks. Cooling System: Radiator inspection, coolant specifications and capacity, water pump maintenance (if applicable). Exhaust System: Exhaust pipe and silencer inspection, gasket replacement. Frame Bodywork: Frame inspection, body panel removal and installation, seat, fenders, and fairings. Electrical Wiring: Complete wiring diagrams, component location, troubleshooting electrical issues. Procedures Included Preventative Maintenance: Routine checks, lubrication points, filter replacement intervals, spark plug service. Troubleshooting: Diagnostic procedures for common problems, symptom-based troubleshooting guides. Repair Overhaul: Detailed step-by-step instructions for component disassembly, repair, and reassembly. Adjustment Calibration: Carburetor, clutch, and throttle cable adjustments. Specifications Data: Torque specifications, clearances, fluid capacities, electrical component values. Technical Depth Depth: Comprehensive, from basic maintenance to full engine and gearbox rebuilds. 📊 Manual Specifications File Format Digital Format: PDF Print Quality Quality Description: High-resolution, clear text and diagrams suitable for printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 2-stroke, reed valve Bore X Stroke: 56.0 mm x 50.7 mm (typical for DT125 variants) Displacement: 124 cc Compression Ratio: Approx. 7.5:1 (typical for this era, varies with specific tuning) Performance Horsepower: Approx. 23-25 HP (at crank, figures vary by market and tuning) Torque: Approx. 20-22 Nm (at crank, figures vary) Fuel System Carburetor: Mikuni VM28 (common fitment for DT125 series) Fuel Type: Unleaded gasoline (minimum 91 octane recommended), requires pre-mix oil Oil Mixing: Autolube system (separate oil injection tank) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Clutch Type: Wet, multi-disc, cable-operated Final Drive: Chain drive 📐 Dimensions Exterior Length: Approx. 2120 mm (varies slightly) Width: Approx. 825 mm (varies slightly) Height: Approx. 1205 mm (varies slightly) Seat Height: Approx. 865 mm (varies) Wheelbase: Approx. 1420 mm Weights Dry Weight: Approx. 107 kg (varies by market/configuration) Wet Weight: Approx. 118 kg (with fluids, estimated) 🛡️ Safety Features Ratings Crash Safety: N/A (Motorcycle safety ratings differ from automobiles; primary safety relies on rider skill and adherence to traffic laws). Active Features Braking System: Disc brakes front and rear. Lighting: Headlight, taillight, turn signals (street-legal variants). Passive Features Frame Construction: Steel perimeter frame for rigidity and durability. 💡 Technology Features Infotainment Display: Analog speedometer and tachometer, odometer, trip meter, and indicator lights. Driver Assistance Rider Aids: None (standard for this class of motorcycle from this era). Connectivity Connection Features: N/A 🔧 Maintenance Service Intervals Oil Change: Refer to manual for gearbox oil change interval (typically every 3,000-5,000 km or annually). Spark Plug Service: Check and clean/replace every 3,000-4,000 km or as needed. Air Filter Cleaning: Clean every 1,000-2,000 km or more frequently in dusty conditions. Chain Lubrication Adjustment: Lubricate every 500 km and adjust slack as needed (typically 20-30mm). Fluid Specifications Gearbox Oil: Yamaha Motorcycle Gear Oil (GL-4) or equivalent, SAE 10W-30 or 10W-40. Capacity: Approx. 1.0-1.2 Liters. Coolant: Yamaha Performance Coolant or equivalent mixture of ethylene glycol and distilled water (50/50). Capacity: Approx. 0.8 Liters. Brake Fluid: DOT 3 or DOT 4 brake fluid. 2-Stroke Oil: High-quality 2-stroke motorcycle oil (e.g., Yamalube 2M) for the Autolube system. Known Issues Carburetor Tuning: Can be sensitive to altitude and temperature changes; requires periodic fine-tuning for optimal performance. Power Valve Sticking: Carbon buildup can cause the power valve to stick, affecting engine response. Requires periodic cleaning. Suspension Seals: Front fork seals can wear over time, leading to leaks, especially with aggressive off-road use. Electrical Connections: Corrosion or loose connections can cause intermittent electrical issues, particularly in humid or wet environments. 📚 Vehicle History Brand Heritage Yamaha Motorcycles:...