🏷️ Basic Information Identification Make: Aprilia Model: RS125 Model Variant: RS 125 (Rotax 122) Codes Chassis Code Range: AP000000 - AP049999 (approximate, may vary by region/specific model year) 👋 Introduction Market Position Market Position: The Aprilia RS125 was a highly regarded lightweight sportbike, popular for its aggressive styling, race-inspired performance, and handling. It competed in the 125cc sportbike segment against rivals like the Yamaha YZF-R125 (later models), Honda RS125GP (though the RS125 was a street-legal variant), and Cagiva Mito. Competitive Analysis Competition: The RS125's key selling points were its potent Rotax 2-stroke engine, capable of performance exceeding many contemporary 4-stroke 250cc bikes, and its chassis derived from Aprilia's racing experience. This manual is crucial for owners seeking to maintain or restore these performance characteristics. Key Features Key Features: Lightweight, agile handling, strong performance for its class, race-replica styling, and the distinctive 2-stroke engine note. The availability of a detailed parts list is essential for keeping this performance-oriented machine operational. 📋 Manual Details Coverage Areas Coverage: Comprehensive coverage for the Aprilia RS125 motorcycle, spanning model years 1999 through 2003. Includes all major mechanical, electrical, and bodywork components. Page Count Page Count: Estimated 300-500 pages (typical for a detailed parts list and technical manual for this era and complexity). Manual Type Manual Type: Parts List / Technical Manual Language Language: English (primary). May contain diagrams with component labels in multiple languages. Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Systems: Engine (Rotax 122 2-stroke, including top-end, bottom-end, cooling, lubrication), Fuel System (carburetor, fuel tank, lines), Ignition System, Exhaust System, Transmission (gearbox, clutch, shifting mechanism), Chassis (frame, subframe, suspension, steering), Brakes (front and rear calipers, master cylinders, lines, discs), Electrical System (wiring harness, lights, battery, charging system, indicators), Wheels and Tires, Bodywork (fairings, seat, tank covers), Controls (throttle, clutch lever, brake lever, footpegs). Procedures Included Procedures: Component identification, part number cross-referencing, assembly/disassembly procedures for major components, torque specifications, fluid capacities, basic troubleshooting based on component identification, exploded diagrams for visual guidance on assembly. Technical Depth Depth: Detailed parts listing with OEM part numbers, allowing for accurate sourcing of spares. Includes technical specifications relevant to parts installation and maintenance. Focuses on identification and procurement of correct components, with some procedural guidance for installation and basic maintenance. 📊 Manual Specifications File Format File Format: Portable Document Format (PDF) Print Quality Print Quality: High-resolution scans of original documentation, ensuring clarity of text and diagrams for printing specific pages. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download - Printable) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, liquid-cooled, single-cylinder Engine Family: Rotax 122 Displacement: 124.8 cc (7.6 cu in) Bore X Stroke: 54 mm x 54.5 mm (2.13 in x 2.15 in) Compression Ratio: 12.5:1 (approximate, can vary with specific engine tuning) Performance Horsepower: Approx. 30-34 HP at 11,000 RPM (depending on market and tuning restrictions) Torque: Approx. 20 Nm (15 lb-ft) at 10,000 RPM Fuel System Carburetor: Dell'Orto VHSB 34 (typically 34mm) or similar high-performance carburetor Fuel Type: Unleaded gasoline, minimum 95 RON (91 AKI) Oil Mixture: Pre-mix or Automatic Oil Injection System (check specific model variant). For premix, typically 2-stroke engine oil at 2-3% ratio. Intake: Reed valve induction Cooling Cooling System: Liquid-cooled Lubrication Lubrication System: Crankshaft and connecting rod bearings lubricated by fuel-oil mixture or automatic injection system. Gearbox lubricated by transmission oil. 🔧 Transmission Standard Transmission Type: 6-speed manual gearbox Features Clutch Type: Wet multi-plate, cable-actuated Gear Ratios: Specific ratios vary slightly by year and market but are optimized for sporty performance (e.g., 1st: ~2.6, 2nd: ~1.9, 3rd: ~1.5, 4th: ~1.2, 5th: ~1.0, 6th: ~0.85). Final Drive: Chain drive (typically 520 pitch chain, 16T front sprocket, 47T rear sprocket - check manual for exact ratios) 📐 Dimensions Exterior Length: Approx. 1970 mm (77.6 in) Width: Approx. 720 mm (28.3 in) (at handlebars) Height: Approx. 1145 mm (45.1 in) (at seat) Wheelbase: Approx. 1370 mm (53.9 in) Weights Dry Weight: Approx. 131 kg (289 lbs) Fuel Tank Capacity: Approx. 12 liters (3.17 US gal) Wheels Tires Front Tire Size: 110/70-17 Rear Tire Size: 150/60-17 Wheel Type: Cast aluminum alloy 🛡️ Safety Features Passive Features Frame Construction: Aluminum alloy perimeter frame, derived from racing technology. Braking System: Dual disc front brakes with 4-piston calipers (e.g., Brembo or similar high-performance), single disc rear brake with 2-piston caliper. Suspension Front: Upside-down telescopic fork (e.g., Marzocchi or Paioli), with adjustable preload and compression/rebound damping. Suspension Rear: Monoshock absorber with adjustable preload, compression, and rebound damping (e.g., Sachs or similar). Active Features Lighting: Dual halogen headlamps, LED tail light, front and rear turn signals. 💡 Technology Features Infotainment Infotainment Features: Basic analog instrumentation: speedometer, tachometer, engine temperature gauge, odometer, trip meter. No advanced infotainment systems present. Driver Assistance Driver Assistance Features: None. Focus is on rider control and mechanical feedback. Connectivity...