The Yamaha TZ125, model code TZ125G1, is a high-performance racing motorcycle produced between 1990 and 2005. Engineered for competition, this two-stroke, single-cylinder machine typically features a 124cc displacement and delivers power in the range of 30-40 HP, making it a formidable contender in its class. With a focus on agility and rider control, the TZ125 is built upon an extensive heritage in motorcycle racing, embodying a commitment to performance and reliability on the track. Its lightweight design, estimated to be under 100 kg dry weight, combined with a precise 6-speed sequential gearbox and a responsive chassis, ensures a thrilling and competitive racing experience. This comprehensive workshop repair service manual provides in-depth coverage for all TZ125 models, engines, trims, and transmission types from 1990 to 2005. Written in English, it serves as an essential resource for owners, mechanics, and racing teams, detailing scheduled maintenance, routine service, and step-by-step repair procedures for every major system, including the engine, fuel, cooling, drivetrain, chassis, and electrical systems. The manual offers professional-level diagnostic and troubleshooting guidance, ensuring the optimal performance and longevity of your TZ125. Its digital format allows for easy navigation, printing of specific sections, and zoom functionality, providing access to critical information. 🏷️ Basic Information Identification Make: Yamaha Model: TZ125 Model Code: TZ125G1 Production Years Covered: 1990-2005 Codes Vehicle Type: Racing Motorcycle 👋 Introduction Market Position Target Audience: Yamaha TZ125 owners, mechanics, racing teams Competitive Analysis Advantage Over Paper: No physical wear, easy printing of specific sections, instant access Key Features Authenticity: Original Yamaha workshop manual, same as used in service shops Completeness: Complete and intact, no missing or corrupt parts Content Quality: Professional quality, highly detailed 📋 Manual Details Coverage Areas Primary Focus: Service, Repair, Maintenance, Troubleshooting Model Variants Covered: All Models, Engines, Trim, Transmissions Types Page Count Estimated Page Count: Hundreds (Specific number not provided in product information) Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Top End, Lubrication System, Engine Removal/Installation Fuel System: Comprehensive coverage Cooling System: Detailed information Drivetrain: Clutch, Crankshaft, Transmission, Final Drive Chassis: Wheels/Tires, Brakes, Suspension, Steering, Frame Electrical System: Detailed wiring diagrams, troubleshooting procedures General Information: Included Appendix: Included Procedures Included Maintenance: Scheduled maintenance, routine service Repair: Step-by-step repair procedures, disassembly, assembly, reinstallation Troubleshooting: Diagnostic procedures for various systems Diagnostics: Comprehensive diagnostic information Technical Depth Depth: Professional technician level, detailed information 📊 Manual Specifications File Format Format: PDF Searchable: Implied by digital format, likely searchable text Print Quality Printable: Full Printable Zoom Functionality: YES Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Delivery Delivery Method: Instant Download Requirements Software Requirements: Adobe PDF Reader & WinZip Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, single-cylinder (typical for TZ125) Displacement: 124cc (for TZ125) Performance Horsepower: Specific figures vary by year and tuning, but typically in the 30-40 HP range for this era racing 125cc. Torque: Not specified in product information, but significant for racing applications. Fuel System Fuel Delivery: Carburetor (likely Mikuni TMX series for this model/era) Fuel Type: High-octane gasoline, often mixed with 2-stroke oil Lubrication System Lubrication Method: Pre-mix or oil injection (typical for racing 2-strokes) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh sequential gearbox Optional Gear Ratios: Specific ratios would be detailed in the manual. Features Clutch Type: Wet, multi-plate clutch 📐 Dimensions Exterior Wheelbase: Specific dimensions not provided in product information, but typical for a 125cc racing motorcycle. Weights Dry Weight: Significantly light, typically under 100 kg for this class. 🛡️ Safety Features Ratings Safety Features: Focus is on performance and rider control, typical safety features for a racing bike (e.g., effective braking system). 💡 Technology Features Infotainment Infotainment Systems: N/A (Pure racing motorcycle, minimal rider comfort features) Driver Assistance Driver Assistance Features: N/A (Rider-focused performance) Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Routine Maintenance: Detailed in the manual, typically involving frequent checks of chain tension, tire pressure, brake fluid, and engine tuning. Top-end rebuilds are common for racing 2-strokes. Fluid Specifications Engine Oil: Specific 2-stroke racing oil recommendations would be detailed in the manual. Transmission Oil: Specific gear oil (e.g., SAE 80 or 90) and capacity would be in the manual. Brake Fluid: DOT 3 or DOT 4 typically for hydraulic brakes. Coolant: If liquid-cooled, specific coolant type and mixture would be specified. Known Issues Common Wear Items: Piston rings, spark plugs, clutch plates, transmission components, and wheel bearings are common wear items on high-performance racing 2-strokes. Tuning Sensitivity: 2-stroke engines, especially racing ones, are highly sensitive to tuning (carburetion, ignition timing) which is extensively covered in the manual. 📚 Vehicle History Brand Heritage Yamaha Motorcycles: Yamaha has a long and successful history in motorcycle racing, particularly in Grand Prix racing with its TZ series....