🏷️ Basic Information Identification Make: Yamaha Model: DT125RE Model Years Covered: 2004, 2005, 2006, 2007 Codes Product Identifier: Yamaha DT125RE 2004-2007 Repair Service Manual PDF 👋 Introduction Market Position Positioning: A robust dual-sport motorcycle known for its off-road capability and reliable two-stroke engine, popular in its era for light trail riding and commuting. Competitive Analysis Competitors: Competed with other dual-sport motorcycles in the 125cc class from brands like Honda (CRM125), Kawasaki (KDX125), and Suzuki (TS125). Key Features Features: Lightweight chassis, capable suspension, reliable two-stroke power, versatile for on-road and off-road use. 📋 Manual Details Coverage Areas Scope: Comprehensive workshop service and repair Page Count Total Pages: 318 Manual Type Type: Workshop Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine disassembly, assembly, tuning, troubleshooting, and diagnostics. Fuel System: Carburetor inspection, adjustment, cleaning, and repair; fuel tank and lines maintenance. Cooling System: Radiator, hoses, thermostat, and coolant checks and replacement. Ignition System: Spark plug specifications, ignition coil testing, CDI unit diagnostics. Transmission Drivetrain: Clutch operation, gearbox inspection, lubrication, and troubleshooting. Chassis Suspension: Front fork disassembly, servicing, and adjustment; rear shock absorber inspection and replacement. Braking System: Front and rear brake pad replacement, caliper servicing, hydraulic system bleeding, and inspection. Electrical System: Wiring diagrams, lighting system, battery maintenance, charging system testing, and starter motor troubleshooting. Wheels Tires: Tire pressure recommendations, wheel bearing maintenance, spoke tension adjustment. Frame Bodywork: Frame inspection, fairing removal and installation, seat maintenance. Procedures Included Maintenance: Routine servicing, oil changes, filter replacements, lubrication points, chain adjustment. Troubleshooting: Step-by-step diagnostic procedures for common and uncommon issues. Repair: Detailed instructions for component repair and replacement, including full engine rebuilds. Rebuilds: Complete engine, gearbox, and suspension component rebuild procedures. Adjustments: Carburetor, clutch, brake, and suspension adjustments. Wiring Diagrams: Clear and detailed electrical schematics. Technical Depth Depth: Designed for professional technicians, covering detailed diagnostic procedures and complete overhaul instructions. 📊 Manual Specifications File Format Format: PDF Print Quality Quality: High resolution, suitable for printing individual pages or the entire manual. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Type: 2-stroke, liquid-cooled, reed valve Displacement: 124cc Bore X Stroke: 56.4 mm x 49.1 mm Compression Ratio: 7.4:1 (approx.) Performance Horsepower: Approx. 17-20 HP (depending on market regulations) Torque: Approx. 10-12 lb-ft (depending on market regulations) Fuel System Carburetor: Mikuni VM28 or similar Fuel Type: Unleaded gasoline (min. 91 octane recommended) Oil Mixture: Pre-mix or Autolube (Yamalube 2-stroke oil recommended) 🔧 Transmission Standard Type: 6-speed constant mesh Optional Options: N/A Features Clutch: Wet, multiple-disc Final Drive: Chain drive 📐 Dimensions Exterior Length: Approx. 2070 mm (81.5 in) Width: Approx. 825 mm (32.5 in) Height: Approx. 1170 mm (46.1 in) Wheelbase: Approx. 1380 mm (54.3 in) Weights Dry Weight: Approx. 120 kg (264.6 lbs) Curb Weight: Approx. 127 kg (280 lbs) Fuel Capacity: 10 Liters (2.6 US gal) 🛡️ Safety Features Ratings Safety Standards: Designed to meet relevant motorcycle safety standards of the time. Active Features Brakes: Disc brakes front and rear for effective stopping power. Lighting: Headlight, taillight, and turn signals for visibility. Passive Features Frame Construction: Durable steel frame provides a stable riding platform. 💡 Technology Features Infotainment Features: Basic analog instrumentation including speedometer, odometer, and indicator lights. Driver Assistance Features: N/A (This model predates significant driver-assistance technologies on motorcycles). Connectivity Features: N/A (No onboard connectivity features). 🔧 Maintenance Service Intervals Oil Change: Every 3,000 km (1,800 miles) or annually. Air Filter Cleaning: Every 1,000 km (600 miles), or more frequently in dusty conditions. Spark Plug Check: Every 3,000 km (1,800 miles). Chain Lubrication Adjustment: Every 500 km (300 miles) or after washing/riding in rain. Fluid Specifications Engine Oil: Yamalube 2-stroke oil or equivalent (API TC, JASO FD) Transmission Oil: Yamaha Gear Oil (e.g., 10W-30 API SE or higher) Coolant: Yamaha Coolant or equivalent (ethylene glycol based, 50/50 mix with distilled water) Known Issues Common Problems: Carburetor gumming if not used regularly, exhaust port blockage on 2-stroke engines, potential wear on reed valves, rear shock absorber wear. Preventative Maintenance: Regular cleaning of the carburetor, proper fuel storage, timely engine lubrication, and checking for exhaust leaks. 📚 Vehicle History Brand Heritage Heritage: Yamaha's long history in motorcycle manufacturing, particularly with off-road and dual-sport models, dating back to the iconic DT series. Model Evolution Evolution: The DT125RE is part of the evolved DT lineage, incorporating technological advancements and design updates over its predecessors. Production Production Period: The DT125RE was produced for several years, with this manual specifically covering the 2004-2007 model years. Manufacturing Location: Primarily manufactured in Japan. 🏆 Awards & Recognition Recognitions Awards: The DT series has a strong reputation and enthusiast following, often recognized for its durability and off-road prowess rather than specific awards.