🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Year: 1997 Type: Sportbike Codes Chassis Code Range: RP00000 and above Engine Code Prefix: RP 👋 Introduction Market Position Positioning: The Aprilia RS 125 was a highly regarded entry-level sportbike known for its sharp styling, capable chassis, and potent 2-stroke performance, often seen as a step up from more basic 125cc offerings. It competed with bikes like the Yamaha TZR125 and Honda CBR125R (though the CBR125R came later). Competitive Analysis Strengths: Lightweight, nimble handling, strong mid-range power from the 2-stroke engine, aggressive styling mimicking larger Aprilia sportbikes. Weaknesses: 2-stroke engine requires more frequent maintenance and specific oil, can be finicky if not set up correctly, potential for wear on the cylinder and piston with aggressive use. Key Features Design: Aerodynamic fairings, clip-on handlebars, rear-set footpegs, aluminum frame. Engine Type: 2-stroke single cylinder with reed valve induction and advanced exhaust port technology (often featuring an electronically controlled exhaust valve for improved power delivery across the rev range). 📋 Manual Details Coverage Areas Primary Coverage: Mechanical and electrical systems Secondary Coverage: Bodywork, chassis, suspension, brakes, diagnostics Page Count Estimated Pages: Approximately 300-400 pages (typical for this era and complexity) Manual Type Type: Repair Service Manual Purpose: Professional technicians and advanced DIY enthusiasts Language Language: English (standard for international releases) Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: 2-stroke, single-cylinder, liquid-cooled engine (Rotax 122) Fuel System: Carburetion (likely Dell'Orto PHBH 28 or similar), fuel tank, fuel lines Ignition System: Electronic ignition, CDI, spark plugs, wiring Exhaust System: Expansion chamber, mufflers, exhaust valve system (ATAC or similar) Cooling System: Liquid cooling, radiator, coolant reservoir, fan, thermostat Transmission: 6-speed constant mesh, clutch operation, gearbox disassembly/assembly Frame And Suspension: Aluminum twin-spar frame, telescopic front forks (likely Marzocchi or Paioli), rear monoshock suspension (likely Sachs or Paioli), swingarm Brakes: Front disc brake (dual piston caliper), rear disc brake (single piston caliper), hydraulic system, brake fluid specifications Electrical System: Battery, alternator, starter motor, lighting (headlight, taillight, indicators), horn, wiring diagrams, fuses Bodywork And Fairings: Fairing removal/installation, seat, fuel tank cover, fenders Wheels And Tires: Wheel removal/installation, tire pressure specifications, common tire sizes Procedures Included Maintenance: Scheduled maintenance checks, oil changes, filter replacements, chain adjustment, spark plug replacement, coolant checks, brake fluid checks Troubleshooting: Diagnostic procedures for common starting, running, and electrical issues Repair: Engine rebuild procedures, transmission overhaul, suspension component replacement, brake system repair, electrical component diagnosis and repair Technical Data And Specs: Torque specifications, clearances, fluid capacities, electrical specifications Technical Depth Depth: Comprehensive, covering everything from basic adjustments to complete engine and transmission rebuilds, including electrical system diagnostics and wiring diagrams. 📊 Manual Specifications File Format Format: PDF Searchable: Typically yes, depending on the source scan quality. Print Quality Quality: Digital reproduction, variable depending on original scan quality. Generally clear enough for detailed examination of diagrams and text. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Completeness Scope: Full factory service manual content ⚙️ Engine Specifications Primary Engine Engine Type: Rotax 122, 2-stroke, single-cylinder, liquid-cooled, reed-valve induction Bore X Stroke: 54 mm x 54.5 mm Displacement: 125 cc Compression Ratio: Approx. 12.5:1 (varies slightly by model year/tune) Exhaust Valve System: Rotax Electronic Exhaust Valve (EEV) or similar system for optimized power band. Performance Horsepower: Approx. 30-34 HP at 11,000 RPM (claimed at crank, actual may vary) Torque: Approx. 1.9 kgf-m (13.7 lb-ft) at 10,000 RPM (claimed) Fuel System Carburetor: Dell'Orto PHBH 28 AS or PHBH 28 BD (often with specific jetting for the RS 125) Fuel Type: Unleaded gasoline (minimum 95 RON recommended) 2-Stroke Oil Mixture: Automatic oil injection system, requires specific 2-stroke engine oil (e.g., Castrol TTS or equivalent fully synthetic). 🔧 Transmission Standard Gearbox: 6-speed constant mesh Features Clutch: Wet, multi-plate, cable-actuated Final Drive: Chain drive Gear Ratios: Specific ratios are detailed within the manual for each gear. Transmission Oil Spec: Typically SAE 80W/90 gear oil (check manual for exact specification and quantity). 📐 Dimensions Exterior Overall Length: Approx. 1950 mm (varies slightly by fairing design) Overall Width: Approx. 720 mm (at handlebars) Overall Height: Approx. 1050 mm (at seat) Weights Dry Weight: Approx. 131 kg Wet Weight: Approx. 149 kg (fully fueled and ready to ride) Fuel Tank Capacity: Approx. 14 liters (including reserve) Seat Height: Approx. 810 mm Wheelbase: Approx. 1350 mm 🛡️ Safety Features Ratings Safety Standards: Conforms to relevant European motorcycle safety standards of the era. Active Features Brakes: Powerful dual disc front brake, single disc rear brake with braided stainless steel lines for improved feel and performance. Suspension: High-quality adjustable front forks and rear monoshock contribute to stable handling and rider control. Passive Features Lighting: Adequate halogen headlight, taillight, and turn signals for visibility. Frame Construction: Rigid twin-spar aluminum frame provides excellent chassis stability. 💡 Technology Features Infotainment Dashboard: Analog speedometer and tachometer, odometer,...