🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Year: 2003 Codes Chassis Code: AP8114205 Engine Code Prefix: Rotax 122 👋 Introduction Market Position Segment: Lightweight Sportbike / Supersport Target Audience: Enthusiasts, aspiring racers, riders seeking a high-performance, track-capable 125cc motorcycle. Competitive Analysis Key Competitors 2003: Yamaha YZF-R125 (later model), Honda CBR125R, Suzuki GSX-R125 (later model), Cagiva Mito. Key Features Performance Oriented: Designed for sporting performance with a potent two-stroke engine. Styling: Aggressive, race-replica styling mimicking larger Aprilia sportbikes. Handling: Renowned for sharp and agile handling characteristics. Premium Components: Often equipped with higher-spec suspension and braking components compared to competitors. 📋 Manual Details Coverage Areas Regions Covered: Global (primarily European market focus) Page Count Estimated Page Count: 350-450 Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Full disassembly, inspection, assembly, and tuning of the Rotax 122 two-stroke engine. Fuel System: Carburetor (Dell'Orto PHBH 28 AS) tuning, jetting, overhaul, and fuel pump operation. Ignition System: CDI ignition system, timing, spark plug selection and maintenance. Cooling System: Radiator, water pump, thermostat, coolant replacement, and bleeding procedures. Transmission Gearbox: 6-speed sequential gearbox, clutch operation, lubrication, and overhaul. Frame And Bodywork: Chassis inspection, fairing removal/installation, seat, fuel tank, and body panel maintenance. Suspension Front: Upside-down telescopic fork (Marzocchi or Paioli), oil levels, seal replacement, and fork service. Suspension Rear: Monoshock (Sachs or similar), linkage inspection, shock absorber maintenance, and adjustment. Braking System Front: Hydraulic disc brake, caliper service, pad replacement, fluid flush, and master cylinder maintenance. Braking System Rear: Hydraulic disc brake, caliper service, pad replacement, fluid flush, and master cylinder maintenance. Electrical System: Wiring diagrams, lighting system, battery maintenance, starter motor, and instrument cluster. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, spark plug service, air filter cleaning. Troubleshooting Diagnostics: Step-by-step diagnostic procedures for common starting, running, and electrical issues. Engine Rebuild: Complete engine disassembly, piston replacement, cylinder honing, crankshaft bearing replacement, seal renewal. Clutch Replacement: Detailed procedure for clutch plate and spring replacement. Carburetor Rebuild: Complete carburetor overhaul, including jet replacement, float adjustment, and diaphragm inspection. Suspension Overhaul: Fork seal and oil replacement, shock absorber maintenance. Electrical Component Testing: Testing of CDI unit, rectifier, stator, and light bulbs. Bodywork Repair: Fairing repair and painting guidance, decal application. Technical Depth Depth Level: Comprehensive (from basic checks to full engine rebuilds and advanced electrical diagnostics). 📊 Manual Specifications File Format Digital Format: PDF Searchability: Searchable text content for quick information retrieval. Print Quality Print Readability: High-resolution scans ensuring clear diagrams and legible text for printing. Binding Type Binding For Physical: N/A (Digital Download) Paper Type Paper For Physical: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Rotax 122, 2-stroke, liquid-cooled, single-cylinder with exhaust valve (A.E.T. - Aprilia Exhaust Timing). Bore X Stroke: 54 mm x 54.5 mm Displacement: 124.8 cc Compression Ratio: 12.2:1 (typical) Power Output Hp: Approx. 34-35 hp (unrestricted European models) at 11,000 rpm Power Output Kw: Approx. 25-26 kW Torque Nm: Approx. 21 Nm at 10,500 rpm Performance Top Speed Kph: Approx. 150-160 kph (unrestricted) Fuel System Carburetor Model: Dell'Orto PHBH 28 AS or PHBH 30 AS (depending on specific market/variant) Fuel Type: Unleaded gasoline, minimum 95 RON recommended. Fuel Delivery: Gravity feed with integrated oil injection system (separate oil reservoir). Ignition System Ignition Type: Electronic ignition (CDI) with variable ignition timing controlled by an electronic control unit (ECU). Lubrication Oil System: Premix or Automatic Oil Injection (separate oil tank). Cooling System Cooling Method: Liquid-cooled 🔧 Transmission Standard Transmission Type: 6-speed constant mesh sequential gearbox. Features Clutch Type: Wet multi-plate clutch. Final Drive: Chain drive. 📐 Dimensions Exterior Length: Approx. 1950 mm Width: Approx. 700 mm Height: Approx. 1100 mm Wheelbase: Approx. 1360 mm Weights Dry Weight Kg: Approx. 130 kg Wet Weight Kg: Approx. 145 kg (estimated) Fuel Tank Capacity Liters: Approx. 13 liters Oil Tank Capacity Liters: Approx. 1.3 liters 🛡️ Safety Features Ratings Safety Certification: CE compliant (European standards). Active Features Braking System Type: Dual disc front, single disc rear. Front Brake Spec: 320 mm single disc, 4-piston radial caliper (e.g., Brembo or Nissin). Rear Brake Spec: 220 mm single disc, 2-piston caliper. Tire Size Front: 110/70-17 Tire Size Rear: 150/60-17 Passive Features Lighting: Dual halogen headlights, LED taillight. 💡 Technology Features Infotainment Instrument Cluster: Analog tachometer, digital speedometer, odometer, trip meter, engine temperature gauge, and indicator lights. Driver Assistance ABS: N/A (Anti-lock Braking System was not typically offered on this model). Connectivity Connectivity Features: N/A (No electronic connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual; typically every 3,000 - 5,000 km or annually. Spark Plug Replacement: Refer to manual; typically every 6,000 - 10,000 km depending on plug type. Air Filter Cleaning: Refer to manual; inspect every 3,000 km, clean/replace as needed. Coolant Replacement:...