This manual covers the Yamaha YZF-R125, a premium 125cc supersport model produced from 2008 to 2015. Known for its R-series styling and advanced technology for its segment, this entry-level sportbike offers impressive performance with its liquid-cooled, 4-stroke, 125cc engine featuring fuel injection and a 6-speed transmission. The YZF-R125 is acclaimed for its design, handling, and engineering quality, making it a popular choice for riders seeking a sporty and reliable machine. This comprehensive workshop service repair manual provides in-depth, professional-quality detail for all aspects of the Yamaha YZF-R125. It includes step-by-step repair and diagnostic procedures for mechanical and electrical systems, routine maintenance guidelines, and detailed troubleshooting for common issues. With hundreds of illustrations and photos, this manual is an essential resource for do-it-yourself enthusiasts and experienced mechanics alike, ensuring the proper maintenance and repair of the vehicle and avoiding costly dealership services. 🏷️ Basic Information Identification Make: Yamaha Model: YZF-R125 Model Years Covered: 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Generation Generation Identifier: First Generation (2008-2015) 👋 Introduction Market Position Target Audience: Do-it-yourselfer and experienced mechanic Segment Description: Premium 125cc supersport, offering R-series styling and technology Competitive Analysis Value Proposition: Inexpensive way to keep vehicle working properly, avoids costly dealership repairs Key Features Content Detail: Hundreds of photos and illustrations, detailed substeps, notes, cautions, and warnings Usability: Numbered instructions, bold figure numbers for easy reference, numbered table of contents 📋 Manual Details Coverage Areas Primary Coverage: Complete Workshop Service Repair Additional Coverage: All Styles Covered Page Count Estimated Page Count: Hundreds of Pages (Specific count not provided but implied substantial) Manual Type Type: Official Factory Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Mechanical Systems: General Information, Fuel System, Cooling System, Engine Top End, Clutch, Engine Lubrication System, Engine Removal/Installation, Crankshaft/Transmission, Wheels/Tires, Final Drive, Brakes, Suspension, Steering, Frame Electrical Systems: Electrical System, Troubleshooting, Wiring Diagrams Suspension Components: Front forks (telescopic, upside-down type), rear monoshock (details on adjustment, seals, fluid) Wheel And Tire Service: Wheel bearing replacement, tire mounting/balancing, wheel alignment checks Brake System Detail: Front and rear disc brake caliper overhaul, master cylinder service, hydraulic line bleeding Electrical System Detail: Ignition system, lighting system, charging system (stator, regulator/rectifier), starter motor, ECU diagnostics, sensor testing Procedures Included Repair Procedures: Step-by-step instructions based on complete disassembly, diagnostic procedures, repair procedures, troubleshooting guides Maintenance Procedures: Routine maintenance, fluid changes, component inspections Engine Rebuild: Detailed procedures for complete engine disassembly, inspection, and reassembly Chassis Component Service: Frame inspection, swingarm bearing service, steering head bearing replacement Technical Depth Depth Of Information: In-depth, Professional Quality, Complete Factory Detail Diagnostic Capabilities: Advanced diagnostics for engine, fuel, electrical, and mechanical systems 📊 Manual Specifications File Format Format: PDF Compatibility: All PC based Windows operating systems and Mac Searchability: Likely text-searchable PDF (standard for professional manuals) Print Quality Printability: Printable without any restriction (entirety or specific pages) Binding Type Delivery Method: Digital Download Paper Type Physical Format Option: Can be burned to CD-ROM (user discretion) Requirements Software Requirement: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 4-stroke, SOHC, 4-valve Displacement: 125cc Bore X Stroke: 52.0 mm x 58.6 mm (Specifics detailed in manual) Compression Ratio: 11.2:1 (Specifics detailed in manual) Performance Horsepower: Approx. 15 PS (Power output varies slightly by region and regulations) Torque: Specific torque figures not provided in product description, but detailed in manual. Fuel System Fuel Delivery: Fuel Injection (Specific system detailed in manual) Fuel Type: Unleaded gasoline 🔧 Transmission Standard Type: Constant mesh, 6-speed Features Clutch Type: Wet, multiple-disc Final Drive Type: Chain drive 📐 Dimensions Exterior Style: Sportbike / Supersport Weights Dry Weight: Approx. 135 kg (Specific weight varies by exact specification) Wet Weight: Approx. 142 kg (Specific weight varies by exact specification, including fluids) 🛡️ Safety Features Active Features Braking System: Hydraulic disc brakes front and rear (specifics detailed in manual) Passive Features Chassis Structure: Deltabox frame (specifics detailed in manual) 💡 Technology Features Infotainment Dashboard Display: Digital LCD instrument cluster (details on functions and diagnostics in manual) Driver Assistance ABS: Optional (Check specific market configuration; ABS troubleshooting in manual if equipped) Connectivity Features: None specific to infotainment/connectivity in this segment, focus is on mechanical and electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific intervals (typically every 5,000-6,000 km or annually) Spark Plug Replacement: Refer to manual for specific intervals Fluid Specifications Engine Oil Type: Yamalube or equivalent SAE 10W-40 API SG type or higher, JASO MA compliant (specifics in manual) Coolant Type: Ethylene glycol-based non-ammonia coolant, 50% mixture with de-ionized water (specifics in manual) Transmission Oil Type: Yamalube Gear Oil or equivalent API GL-4, SAE 80W (specifics in manual) Known Issues Common Wear Items: Chain and sprockets, brake pads, tires, clutch plates (detailed diagnosis and replacement in manual) Electrical Component Check: Battery health, charging system, switchgear...