🏷️ Basic Information Identification Make: Aprilia Model: RS125 Year: 1999 Codes Model Code: APRX125RS99 Engine Code: Rotax 122 👋 Introduction Market Position Segment: Lightweight Supersport Motorcycle Target Audience: Enthusiasts, DIY mechanics, professional workshops working on the Aprilia RS125. Competitive Analysis Key Competitors: Yamaha YZF-R125, Honda CBR125R, Suzuki GSX-R125, Cagiva Mito. Key Features Performance Focus: The RS125 is renowned for its sharp handling and sporty performance, making a detailed service manual essential for maintaining its capabilities. Manual Utility: Provides critical technical data and procedures to keep the RS125 running optimally and to perform complex repairs. 📋 Manual Details Coverage Areas Systems Covered: Engine, Fuel System, Ignition System, Cooling System, Exhaust System, Transmission, Clutch, Chassis, Suspension (Front and Rear), Brakes (Front and Rear), Electrical System, Wiring Diagrams, Bodywork, Fairings, Wheels and Tires, Troubleshooting, Maintenance Page Count Total Pages: Estimate: 300-400 pages (typical for comprehensive workshop manuals of this era) Manual Type Type: Service and Repair Workshop Manual Language Language: English Format Format: Digital (Likely PDF, searchable text, printable) File Format: Digital (Likely PDF) Searchability: Searchable text content for quick information retrieval. Printability: Printable pages for on-the-bench use. 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed breakdown and reassembly of the Rotax 122 engine, including cylinder head, piston, connecting rod, crankshaft, bearings, seals, and timing components. Fuel System: Carburetor (likely Dell'Orto PHBH 28 or similar) adjustment, cleaning, and overhaul. Fuel tank, fuel lines, and fuel filter maintenance. Ignition System: Spark plug specifications, ignition timing, CDI unit testing, and troubleshooting. Cooling System: Radiator, water pump, thermostat, hoses, and coolant specifications. Bleeding procedures. Exhaust System: Expansion chamber maintenance and inspection, exhaust pipe sealing. Transmission: Gearbox disassembly, inspection, and reassembly. Clutch operation, adjustment, and component wear limits. Gear oil specifications. Chassis: Frame inspection, steering head bearing maintenance, and alignment checks. Front Suspension: Fork disassembly, seal replacement, oil type and level specifications, spring pre-load adjustments. Rear Suspension: Monoshock absorber adjustments, linkage lubrication, bearing inspection. Front Brakes: Brake caliper service, pad replacement, disc inspection and wear limits, brake fluid type and bleeding procedures. Rear Brakes: Brake caliper service, pad replacement, disc inspection and wear limits, brake fluid type and bleeding procedures. Electrical System: Battery maintenance, charging system (stator and regulator/rectifier), lighting circuits, starter motor, horn, and switchgear. Wiring Diagrams: Comprehensive, color-coded wiring diagrams for all electrical components and circuits. Bodywork: Fairing removal and installation, seat, fuel tank, and other body panels. Wheels And Tires: Wheel bearing maintenance, tire pressure specifications, recommended tire sizes. Procedures Included Scheduled Maintenance: Detailed procedures for routine maintenance tasks such as oil changes, filter replacements, chain adjustment, and brake checks at specified intervals. Troubleshooting: Systematic diagnostic procedures for common problems and symptoms, guiding mechanics to identify and resolve issues efficiently. Engine Rebuild: Step-by-step instructions for complete engine disassembly, inspection of wear components, replacement of parts (piston, rings, bearings, seals), and reassembly with torque specifications. Carburetor Overhaul: Complete guide to cleaning, rebuilding, and adjusting the carburetor, including jet sizes and needle settings. Suspension Service: Instructions for servicing front forks and rear shock absorbers, including seal replacement, oil changes, and component inspection. Brake System Repair: Procedures for bleeding brakes, replacing pads and discs, servicing calipers, and inspecting brake lines. Electrical Diagnostics: Troubleshooting guides for electrical faults, testing of components like the stator, regulator/rectifier, and ignition coil. Fairing Removal Installation: Detailed instructions on how to remove and refit all body panels for access to components. Technical Depth Depth Level: Comprehensive (Covers everything from basic maintenance to full engine and gearbox rebuilds, including electrical diagnostics and chassis adjustments). 📊 Manual Specifications File Format Document Type: PDF (Portable Document Format) Print Quality Resolution: High resolution (typically 300 dpi or higher for clear diagrams and text). Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, single-cylinder, liquid-cooled Engine Displacement: 124.8 cc (7.62 cubic inches) Bore X Stroke: 54 mm x 54.5 mm Compression Ratio: Approx. 8.1:1 to 8.9:1 (depending on variant) Performance Horsepower Claimed: Approx. 30-33 HP (for unrestricted versions, varies by market and specific model year tuning) Torque Claimed: Approx. 20-22 Nm (for unrestricted versions) Fuel System Carburetor Model: Dell'Orto PHBH 28 (typical, might vary) Fuel Type: Unleaded gasoline (min. 95 RON recommended) Oil Injection: Automatic oil injection system (separate oil reservoir) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh gearbox Clutch Type: Wet multi-plate clutch Features Gear Ratios: Specific ratios provided in manual (e.g., 1st: 2.500, 2nd: 1.778, 3rd: 1.333, 4th: 1.143, 5th: 1.000, 6th: 0.875) Final Drive: Chain drive 📐 Dimensions Exterior Length: Approx. 1960 mm Width: Approx. 720 mm Height: Approx. 1115 mm Wheelbase: Approx. 1370 mm Weights Dry Weight: Approx. 120 kg (99 kg claimed for some earlier models) Wet Weight: Approx. 137 kg (fully fueled) 🛡️ Safety Features Ratings Safety Features: Disc brakes front and rear, robust chassis construction, halogen headlight. 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