🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Sub Model: Sport Production Generation Start Year: 1999 End Year: 2003 Codes Engine Codes: Rotax 122 Chassis Codes: RV125 👋 Introduction Market Position Positioning: High-performance 125cc sportbike, popular for track days and street use, often chosen by younger riders for its racing pedigree. Competitive Analysis Competitors: Yamaha YZF-R125 (later models), Honda CBR125R (later models), Cagiva Mito 125. Key Features Unique Selling Points: Race-derived styling, strong performance for its class, potent 2-stroke engine, sophisticated chassis and suspension. Manual Value Proposition Benefit To User: Empowers owners to perform repairs and maintenance themselves, saving significant costs compared to professional shop labor. Provides in-depth knowledge for proper upkeep and restoration. 📋 Manual Details Coverage Areas Primary Coverage: Full service, repair, diagnostics, maintenance, and restoration. Secondary Coverage: Technical specifications, troubleshooting guides, wiring diagrams. Page Count Estimated Pages: Refer to specific edition for exact count; comprehensive coverage implies extensive pages. Manual Type Type: Service Repair Manual Language Language: English Format Format: PDF Delivery: Instant Digital Download 📖 Manual Coverage Systems Covered Engine Mechanical: General Information, Engine Removal and Installation, Cylinder Head/Valves, Crankcase/Piston/Cylinder, Crankshaft/Transmission/Balancer, Engine Combustion System. Engine Ancillary: Engine Fuel System, Engine Lubrication and Cooling, Lubrication System, Cooling System, Fuel Injection System. Transmission: Gearbox & Clutch, Transmission System. Chassis And Suspension: Front Wheel and Steering System, Rear Wheel System, Chassis, Suspension. Brakes: Braking System. Electrical: Alternator/Starter Clutch, Battery/Charging System, Ignition System, Electric Starter, Lights/Meters/Switches, Wiring Diagrams. Bodywork And Exhaust: Fenders and Exhaust Pipe, Body & Fixtures, Frame/Body Panels/Exhaust System. Wheels And Tires: Wheels & Tyres. Procedures Included Maintenance: Periodic checks & Adjustments, routine service, fluid changes, filter replacements. Repair: Engine rebuild, gearbox overhaul, suspension service, brake caliper servicing, electrical component replacement. Diagnostics: Troubleshooting, fault finding, diagnostic flowcharts. Disassembly Assembly: Engine removal/installation, component disassembly and reassembly for all covered systems. Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and chassis rebuilds, including detailed electrical schematics and fuel injection system diagnostics. 📊 Manual Specifications File Format File Type: PDF Readability: Optimized for digital viewing and printing. Print Quality Printability: All pages are printable. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Compatibility Operating Systems: All Versions of Windows & Mac Requirements Software: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, single-cylinder Displacement: 124.8 cc (7.6 cu in) Bore X Stroke: 54 mm x 54.5 mm (2.13 in x 2.15 in) Cooling System: Liquid-cooled Ignition System: Electronic ignition (CDI) Performance Horsepower: Approx. 30-35 HP (varies by market regulations and specific model variant) Torque: Approx. 20-23 Nm (varies) Fuel System Carburetor: Dell'Orto PHBH 28 (or similar) Fuel Injection: May feature electronic fuel injection (CAT-I) on later models within this range. Lubrication Lubrication Type: Pre-mix or Autolube system (depending on exact model variant) 🔧 Transmission Standard Gearbox Type: 6-speed constant mesh Clutch Type: Wet, multi-plate Features Final Drive: Chain drive 📐 Dimensions Exterior Length: Approx. 2000 mm (78.7 in) Width: Approx. 700 mm (27.6 in) Height: Approx. 1130 mm (44.5 in) Weights Dry Weight: Approx. 130-135 kg (287-298 lbs) Fuel Capacity: Approx. 7.8 - 9.5 Liters (2.0 - 2.5 Gallons), including reserve. 🛡️ Safety Features Ratings Crash Safety: Not officially rated in the same way as cars; relies on rider skill and protective gear. Active Features Braking System: Front: Disc brake (e.g., Brembo calipers); Rear: Disc brake. Suspension Features: Upside-down (USD) front forks, Monoshock rear suspension. Passive Features Lighting: Halogen headlights, taillights, turn signals. 💡 Technology Features Infotainment Display: Analog tachometer and speedometer, digital odometer and other indicators. Driver Assistance Assistance Systems: No electronic rider aids such as ABS or traction control commonly found in this era and class. 🔧 Maintenance Service Intervals Oil Change: Refer to manual for specific interval based on usage; 2-stroke requires oil for fuel/oil mixture or autolube system. Spark Plug Inspection: Typically every 3,000-5,000 km (1,800-3,000 miles). Air Filter Cleaning: Regular inspection and cleaning/replacement as per manual, often every 5,000-10,000 km. Chain Lubrication Adjustment: Every 500-1000 km, or after riding in wet conditions. Fluid Specifications Coolant: Ethylene glycol-based coolant (e.g., Motul Motocool Expert, Castrol Radicool). Brake Fluid: DOT 4 Gearbox Oil: SAE 10W-40 API SG or higher, or specific Aprilia recommendation. 2-Stroke Oil: High-quality synthetic 2-stroke engine oil for performance applications (e.g., Motul 710 2T, Castrol TTS). Known Issues Common Problems: Potential for exhaust power valve issues if not maintained, carburetor jetting sensitivity to altitude/temperature, wear on the 2-stroke piston and rings at higher mileage. Electrical Quirks: Occasional issues with stator or rectifier on older models, wiring harness integrity. Cooling System Maintenance: Regular flushing and inspection of hoses due to the liquid-cooled nature of the engine. 📚 Vehicle History Brand Heritage Brand Focus: Aprilia is renowned for its motorsport heritage, particularly in Grand Prix racing, specializing in high-performance sportbikes and scooters. Model Evolution Rs125 Lineage: The RS...