The TZR125, produced from 1987 to 1993, is a lightweight sportbike renowned for its aggressive styling and performance-oriented 2-stroke engine featuring the Power Valve System (YPVS). This model represents a strong heritage in performance motorcycling, offering a dynamic riding experience in the competitive 125cc supersport class. Its engineering quality is evident in its liquid-cooled engine, advanced chassis design, and responsive handling, making it a favored choice for riders seeking spirited performance and a connection to Grand Prix-inspired aesthetics. This comprehensive service manual provides full repair coverage for the TZR125, encompassing all chassis codes from 2RM to 3KC. It details essential maintenance procedures, including scheduled servicing, fluid changes, and component inspections, alongside in-depth repair and rebuild instructions for the engine, chassis, suspension, and electrical systems. The manual also includes critical troubleshooting guides and technical specifications, serving as an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance, reliability, and longevity of their TZR125. 🏷️ Basic Information Identification Make: Yamaha Model: TZR125 Generation: 2TR/3ET Model Years Covered: 1987, 1988, 1989, 1990, 1991, 1992, 1993 Codes Chassis Codes: 2RM, 2RN, 2RW, 2RX, 3ET, 3KC 👋 Introduction Market Position Segment: Lightweight Sportbike / Supersport (125cc class) Competitive Analysis Key Rivals: Honda NSR125R, Suzuki RG125 Gamma, Aprilia RS125, Cagiva Mito 125. Key Features Technological Highlights: YPVS (Yamaha Power Valve System) for improved power delivery, liquid cooling, advanced chassis design for its class, aggressive styling. Target Audience Intended Users: Yamaha TZR125 owners, mechanics, restorers, hobbyists requiring detailed service and repair information. 📋 Manual Details Coverage Areas Manual Scope: Full Service Repair Page Count Estimated Pages: Comprehensive (Specific page count not provided, typical for this era of sportbike manuals would be 300-500+ pages) Manual Type Type: Factory Service Manual (FSM) Equivalent / Professional Repair Manual Language Language: English Format File Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, inspection, tuning, lubrication, cooling system, fuel system (carburetor, ignition), exhaust system. Chassis And Suspension: Frame, front fork (telescopic, damping, seals), rear suspension (monoshock, linkage, adjustments), steering system, wheels, tires, brakes (front and rear disc, hydraulic system, calipers, master cylinders). Electrical System: Wiring diagrams, ignition system, lighting, charging system (stator, regulator/rectifier, battery), starter motor, indicators, horn, fuses, troubleshooting. Bodywork And Trim: Fairings, seat, fuel tank, fenders, graphics, fasteners, removal and installation procedures. Procedures Included Maintenance: Scheduled maintenance, fluid changes (oil, coolant, brake fluid), filter replacements, chain adjustment, spark plug replacement, valve clearance check (if applicable to 2-stroke tuning), general inspection. Repair And Rebuild: Complete engine rebuilds, carburetor overhaul, brake system repairs, suspension component replacement, electrical component diagnosis and repair, bodywork repair. Troubleshooting: Diagnostic procedures for common and uncommon faults, problem identification, step-by-step troubleshooting guides for electrical and mechanical issues. Technical Depth Depth: Comprehensive, covering everything from basic maintenance to complete engine and chassis overhauls. Designed for both professional technicians and experienced DIY enthusiasts. 📊 Manual Specifications File Format Digital Format: PDF Print Quality Printability: Full Printable Binding Type Delivery Method: Instant Download (No physical binding, digital delivery) Paper Type Digital Medium: Digital file (for display on screen or print on demand) Software Requirements Reader Software: Adobe PDF Reader Extraction Software: WinRAR (or compatible archive utility) Compatibility Operating Systems: All versions of Windows and Mac OS ⚙️ Engine Specifications Primary Engine Type: 2-Stroke, Liquid-Cooled, Single-Cylinder Displacement: 124.7 cc Bore X Stroke: 56.4 mm x 50.0 mm (typical, may vary slightly by sub-model) Compression Ratio: 7.2:1 (typical, for unleaded fuel) Performance Horsepower: Approx. 20-30 PS (14.7-22 kW) at 10,000-11,000 RPM (depending on market regulations and specific model variant) Torque: Approx. 15-18 Nm at 9,500-10,500 RPM (depending on market regulations and specific model variant) Fuel System Carburetor: Mikuni VM28SS (or similar 28mm slide carburetors) Fuel Type: Unleaded gasoline (minimum 91 RON) Lubrication System: Premix or Autolube (Yamaha Hand-o-Matic oil injection system) Ignition Type: CDI (Capacitor Discharge Ignition) Cooling System: Liquid-cooled Coolant Type: Yamaha Hi-Performance All-Season Motorcycle Coolant or equivalent (50/50 mix of ethylene glycol and distilled water) 🔧 Transmission Standard Type: 6-Speed Constant Mesh Features Clutch: Wet, Multi-plate Final Drive: Chain Drive Transmission Oil Type: Yamalube 2R or SAE 10W-40 API SE (or higher) API SF/SG lubricant (refer to manual for precise specification) 📐 Dimensions Exterior Length: Approx. 1,970 mm Width: Approx. 725 mm Height: Approx. 1,105 mm Weights Dry Weight: Approx. 126 kg Wet Weight: Approx. 136 kg (with fluids) Fuel Capacity Tank Capacity: 14 Liters (including reserve) Wheelbase Wheelbase: Approx. 1,335 mm 🛡️ Safety Features Ratings Braking System: Front: Hydraulic Disc (270mm), Rear: Hydraulic Disc (210mm) Active Features Tires Front: 100/80-17 M/C 52S (tubeless) Tires Rear: 120/80-17 M/C 61S (tubeless) Passive Features Lighting: Halogen Headlight, LED Tail Light (depending on sub-model variant) 💡 Technology Features Infotainment Instrument Cluster: Analog speedometer, tachometer, coolant temperature gauge, neutral indicator, turn signal indicators, high beam indicator. Driver Assistance Ypvs System: Yamaha Power Valve System (YPVS) controlled by...