This manual covers the DT125X series, a lightweight dual-sport motorcycle produced for the 2004 through 2007 model years. Known for its 124cc liquid-cooled, 2-stroke engine, 6-speed transmission, telescopic front forks, and Monocross rear suspension, the DT125X offers a blend of off-road capability and street-legal functionality. Its robust engineering, characteristic of performance heritage, makes it a capable machine for enthusiasts and riders seeking an agile and reliable off-road experience. This comprehensive workshop service manual provides detailed guidance for all aspects of maintenance and repair for the DT125X. It includes in-depth information on engine mechanicals, electrical systems, fuel delivery, transmission, chassis, braking, and bodywork. The manual details routine maintenance procedures, troubleshooting common issues, complete repair and rebuild instructions, inspection and adjustment guidelines, essential torque specifications, and clear wiring diagrams. With its extensive coverage, this manual is an indispensable resource for owners and technicians aiming to keep the DT125X in optimal condition. 🏷️ Basic Information Identification Make: Yamaha Model: DT125X Model Series: DT125X Series Chassis Code: Likely DE08, specific to DT125X Generation Generation: First Generation (DT125X) Codes Engine Code General: 125cc 2-stroke 👋 Introduction Market Position Category: Lightweight Dual-Sport / Enduro Motorcycle Target Audience: Enthusiasts and owners seeking comprehensive maintenance and repair guidance. Competitive Analysis Competitors General: Honda CR series, Suzuki RM series, Kawasaki KX series (during similar production eras). Key Features Vehicle Engine Type: 2-stroke, liquid-cooled, single-cylinder Transmission: 6-speed constant mesh Suspension Front: Telescopic forks Suspension Rear: Monoshock (Monocross suspension system) Brakes: Disc brakes front and rear Wheel Size Front: Typically 21-inch Wheel Size Rear: Typically 18-inch Key Features Manual Manual Purpose: To guide mechanical technicians through all aspects of repair and maintenance. Scope: Comprehensive service and repair information. 📋 Manual Details Coverage Areas Covered Years: 2004, 2005, 2006, 2007 Page Count Page Count: 318 Manual Type Manual Type: Workshop Service Manual Language Language: English (presumed primary language based on typical Yamaha service manuals for international markets) Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine overhaul, disassembly, assembly, torque specifications, cylinder head, piston, connecting rod, crankshaft, lubrication system, cooling system (liquid-cooled). Engine Electrical: Ignition system, CDI unit, stator, spark plug, wiring diagrams, lighting system, charging system, battery. Fuel System: Carburetor (likely Mikuni VM28 or similar), fuel delivery, fuel tank, fuel filter, fuel lines, mixture adjustment. Transmission: 6-speed gearbox, clutch operation, internal components, lubrication, gear shift mechanism. Chassis And Frame: Frame inspection, steering system, headstock bearings, suspension components (front forks, rear shock absorber), swingarm. Braking System: Hydraulic disc brakes (front and rear), brake calipers, master cylinders, brake fluid, bleeding procedures, pad replacement. Wheels And Tires: Wheel bearings, spoke tensioning, tire selection and pressures, rim specifications. Exhaust System: Exhaust pipe, muffler, sealing, maintenance. Cooling System: Radiator, coolant type and capacity, hoses, thermostat operation. Electrical Component Locations: Identification and function of key electrical components. Bodywork And Trim: Panel removal and installation, seat, fenders, fuel tank covers, decals. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, lubrication points, spark plug checks, air filter cleaning/replacement. Troubleshooting: Diagnostic procedures for common problems, electrical faults, engine performance issues, starting problems. Repair And Rebuild: Detailed step-by-step instructions for component disassembly, repair, and reassembly. Inspection And Adjustment: Precise instructions for adjusting clutch, throttle, brakes, and other critical components. Torque Specifications: Comprehensive list of torque values for all fasteners. Wiring Diagrams: Detailed electrical schematics for all models and variations. Special Tools: Identification of specific tools required for certain maintenance or repair tasks. Technical Depth Depth: Comprehensive. Covers everything from basic maintenance and owner checks to complete engine and transmission rebuilds, electrical system diagnostics, and frame/suspension work. Suitable for professional technicians and advanced DIY mechanics. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High Resolution (typically, for digital manuals of this era, ensuring clarity of diagrams and text). Binding Type Binding Type: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 2-stroke, single-cylinder Displacement: 124 cc (Cubic Centimeters) Bore X Stroke: Approx. 54 mm x 54.5 mm (typical for this engine family) Compression Ratio: Typically around 7.2:1 (or similar for 2-stroke) Power Delivery System: Reed valve induction Performance Horsepower Approx: Approx. 20-25 HP (Varies by region and tuning) Torque Approx: Approx. 15-18 Nm (Varies by region) Fuel System Carburetor Type: Mikuni VM28 (or similar 28mm flat-slide carburetor) is common for this model. Fuel Type: Unleaded gasoline (minimum 90 octane recommended) Fuel Mixture Ratio: 50:1 (Gasoline:2-stroke oil) - Specific oil type to be confirmed in manual. 🔧 Transmission Standard Type: 6-speed constant mesh Clutch Type: Wet, multi-plate Features Gear Ratios: Specific gear ratios are detailed within the manual, crucial for performance tuning. Final Drive: Chain drive 📐 Dimensions Exterior Length Approx: Approx. 2100 mm (dependent on specific configuration) Width Approx: Approx. 800 mm (dependent on specific configuration) Height Approx: Approx. 1200 mm...