🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Year: 2003 Vehicle Type: Sportbike Codes Vin Code Year: 3 👋 Introduction Market Position Positioning: Entry-level performance sportbike, popular for young riders and track day enthusiasts Competitive Analysis Key Competitors: Yamaha YZF-R125, Honda CBR125R, Suzuki GSX-R125 Key Features Design Philosophy: Aggressive styling, inspired by larger Aprilia sportbikes, lightweight chassis Engine Type: High-revving 2-stroke for exciting power delivery Handling: Renowned for sharp, agile handling characteristics 📋 Manual Details Coverage Areas Primary Coverage: Repair and Servicing Secondary Coverage: Maintenance, Troubleshooting, Diagnostics Page Count Estimated Pages: 300-400 Manual Type Type: Factory Repair Service Manual Language Language: English Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine: 2-Stroke, Single Cylinder, Liquid-Cooled (Rotax 122) Fuel System: Carburetion (Dell'Orto PHBH 28/A), Reed Valve Induction Ignition System: Electronic CDI Cooling System: Liquid Cooling, Radiator, Water Pump Transmission: 6-Speed Constant Mesh Clutch: Wet Multi-Plate Chassis: Aluminum Twin Spar Frame Suspension Front: Upside-Down Telescopic Forks (e.g., Marzocchi or Paioli) Suspension Rear: Monoshock Swingarm (Adjustable Preload, Rebound) Brakes Front: Single Disc with 4-Piston Caliper (e.g., Brembo) Brakes Rear: Single Disc with 2-Piston Caliper Wheels Tires: Alloy Wheels, Radial Tires Electrical System: 12V Battery, Lighting, Starter, Instruments Exhaust System: Expansion Chamber, Silencer Procedures Included Scheduled Maintenance: Oil Changes, Filter Replacements, Spark Plug Service, Chain Adjustment Engine Rebuild: Top End Rebuild (Piston, Rings, Cylinder), Bottom End Overhaul, Crankshaft Service Transmission Repair: Clutch Replacement, Gearbox Disassembly and Reassembly Carburetor Service: Cleaning, Adjustment, Jetting Recommendations Suspension Service: Fork Seal Replacement, Shock Absorber Overhaul Brake System Maintenance: Brake Pad Replacement, Bleeding, Caliper Servicing Electrical Troubleshooting: Wiring Diagrams, Component Testing, Fault Diagnosis Bodywork Repair: Fairing Removal/Installation, Panel Repair Technical Depth Diagnostic Procedures: Step-by-step fault finding for common issues Component Overhaul: Detailed instructions for complete disassembly and reassembly of major components Torque Specifications: Crucial torque values for all critical fasteners Clearances And Tolerances: Specifications for piston-to-cylinder, bearing clearances, etc. Wiring Diagrams: Comprehensive electrical schematics Special Tools: Identification and use of specialized tools required for certain procedures 📊 Manual Specifications File Format File Type: PDF Searchability: Text-searchable (OCR) Print Quality Resolution: High-resolution for clarity Illustrations: Clear diagrams and photographs Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Rotax 122, 2-stroke Displacement: 124.8 cc Bore X Stroke: 54 mm x 54.5 mm Compression Ratio: 12.5:1 (approx.) Cooling System: Liquid-cooled Induction: Reed valve, Dell'Orto PHBH 28/A carburetor Performance Horsepower: Approximately 34 hp (depending on region/restrictions) Torque: Approximately 23 Nm (16.9 lb-ft) Fuel System Fuel Type: Unleaded gasoline (min 95 RON recommended) Fuel Tank Capacity: 7.8 Liters (2.06 US gal) Oil Type: 2-stroke synthetic oil (premix or separate oil injection) 🔧 Transmission Standard Type: 6-speed constant mesh Clutch Type: Wet multi-plate Features Final Drive: Chain driven Gear Ratios: Refer to manual for specific ratios (e.g., 1st: 2.46, 2nd: 1.77, 3rd: 1.38, 4th: 1.14, 5th: 1.00, 6th: 0.87) Transmission Oil Type: API GL-4 SAE 75W-90 or equivalent (refer to manual for specific grade) 📐 Dimensions Exterior Length: Approx. 1950 mm Width: Approx. 740 mm Height: Approx. 1145 mm Wheelbase: Approx. 1375 mm Weights Dry Weight: Approx. 140 kg Gross Weight: Refer to manual Weight Distribution: Refer to manual 🛡️ Safety Features Ratings Crash Test Ratings: N/A for motorcycles Active Features Braking System: High-performance disc brakes front and rear Suspension Tuning: Adjustable suspension for optimal road holding Passive Features Frame Construction: Rigid aluminum twin-spar frame for stability Lighting: Halogen headlights, LED taillight 💡 Technology Features Infotainment Instrument Cluster: Analog tachometer, digital speedometer, odometer, trip meter, coolant temperature gauge. Driver Assistance ABS: Not equipped 🔧 Maintenance Service Intervals Oil Change Engine: Every 5,000 km or 1 year (for transmission oil) Spark Plug Replacement: Every 5,000 - 10,000 km (depending on plug type and condition) Air Filter Cleaning: Every 5,000 km Chain Lubrication Adjustment: Every 1,000 km or as needed Top End Rebuild: Typically recommended between 15,000 - 30,000 km depending on usage and maintenance quality Fluid Specifications Coolant Type: Ethylene glycol-based antifreeze mixture (50% water, 50% coolant) Brake Fluid Type: DOT 4 (refer to manual for exact specification) Fork Oil Viscosity: Refer to manual (commonly 5W or 7.5W) Known Issues Common Problems: Carburetor jetting sensitivity, 2-stroke exhaust port carbon buildup, clutch wear, potential electrical gremlins if poorly maintained. Maintenance Emphasis: Proper 2-stroke oil mixture, regular air filter cleaning, and correct jetting are critical for engine longevity and performance. 📚 Vehicle History Brand Heritage Heritage: Aprilia has a strong racing heritage, particularly in smaller displacement categories and Grand Prix racing, which influences its road-going sportbikes. Model Evolution Evolution: The RS 125 has been a staple in Aprilia's lineup for decades, evolving through various iterations with engine updates, chassis refinements, and styling changes. The 2003 model represents a mature design from the early 2000s. Production Manufacturing Location: Italy Production Period: The RS 125 has...