🏷️ Basic Information Identification Make: Aprilia Model: RS125 Model Nickname: Rotax 122 Generation Generation: Fourth Generation (Externally similar to earlier generations, but with internal updates reflecting the 1999-2004 timeframe) Codes Engine Code Prefix: Rotax 122 Chassis Code Prefix: GS 👋 Introduction Market Position Market Position: The Aprilia RS125 is a high-performance, lightweight sportbike that has long been a benchmark in the 125cc class, appealing to younger riders and those seeking an accessible yet thrilling track-day or street-legal experience. This manual serves the needs of owners and independent repair shops servicing this popular model. Competitive Analysis Competitive Analysis: During its production run, the RS125 competed with other 125cc two-stroke sportbikes such as the Yamaha YZF-R125 (though this often featured a four-stroke engine in later years), Honda CBR125R, and Cagiva Mito 125. Its aggressive styling and strong performance from the Rotax engine made it a standout. Key Features Key Features: The RS125 is renowned for its 250cc-derived chassis, powerful 2-stroke Rotax 122 engine (often featuring electric power valve), sophisticated suspension, and aggressive styling. This manual aims to make the complex engineering of this Italian sportbike accessible for maintenance and repair. 📋 Manual Details Coverage Areas Coverage Areas: Complete workshop repair and service information for Aprilia RS125 motorcycles manufactured between 1999 and 2004. Page Count Page Count: Extensive (typically 300+ pages for comprehensive workshop manuals, exact count not specified but implied by 'full professional quality in depth') Manual Type Manual Type: Workshop Repair Manual / Service Manual Language Language: English Format Format: Digital Download (PC, MAC, Tablets, Smartphones) 📖 Manual Coverage Systems Covered Systems Covered: Engine (top-end, bottom-end, cooling, lubrication, fuel injection/carburetion, ignition), Transmission (gearbox, clutch, shifting mechanism), Chassis (frame, suspension - front fork, rear shock absorber), Brakes (front and rear hydraulic systems, caliper service, master cylinders, fluid bleeding), Electrical System (wiring diagrams, lighting, starting, charging, ignition, instrumentation), Fuel System (tank, fuel pump, lines, carburetor/injector specifics), Exhaust System, Cooling System (radiator, water pump), Wheels and Tires, Bodywork and Fairings, General Maintenance, Troubleshooting. Procedures Included Procedures Included: Complete disassembly and reassembly, routine maintenance, periodic inspections, component testing, diagnostic procedures, repair instructions, replacement procedures, torque specifications, special tool requirements, adjustments, lubrication points, troubleshooting flowcharts. Technical Depth Technical Depth: Comprehensive, covering everything from basic rider maintenance (chain adjustment, oil changes) to in-depth engine rebuilds, carburetor tuning (if applicable for specific models within the range), electrical system diagnostics, and suspension overhauls. Designed for professional technicians and experienced home mechanics. 📊 Manual Specifications File Format File Format: PDF (likely, optimized for digital viewing across devices) Print Quality Print Quality: High-resolution, clear text and diagrams suitable for printing. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, two-stroke, single-cylinder Engine Displacement: 125 cc Bore X Stroke: 54 mm x 54.5 mm Engine Code: Rotax 122 E (various sub-versions for different emission standards and fuel systems) Power Valve System: APEC (Aprilia Power-Enhancement Control) or similar electronic/mechanical exhaust valve system for improved torque curve. Performance Horsepower Range: Approx. 30-34 HP (depending on variant and restriction for licensing/emissions) Torque Range: Approx. 22-24 Nm Fuel System Fuel Delivery: Dell'Orto PHBH 28 (or 30mm) carburetor; some later models or specific market versions may have received fuel injection systems (e.g., Athena). Fuel Type: Unleaded Gasoline (95-98 RON recommended) Premix Ratio: 1:50 (Two-stroke oil to gasoline) – Always refer to manual for specific oil type and ratio. Ignition Ignition System: Digital electronic ignition with variable ignition timing Cooling System Cooling Type: Liquid-cooled Coolant Type: Ethylene Glycol based antifreeze (50% mixture with distilled water) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh sequential gearbox Features Clutch Type: Wet multi-plate clutch, cable-actuated Final Drive: Chain drive Gear Ratios: Specific gear ratios available in manual, typically designed for sporty performance. Transmission Oil Type: SAE 75W/90 or SAE 10W/40 motorcycle-specific gearbox oil (refer to manual for exact specification and quantity). 📐 Dimensions Exterior Length: Approx. 1950 mm (varies slightly by year/fairing design) Width: Approx. 720 mm (at handlebars) Height: Approx. 1130 mm (at seat) Wheelbase: Approx. 1370 mm Weights Dry Weight: Approx. 130-135 kg Wet Weight: Approx. 145-150 kg (with all fluids) Fuel Tank Capacity: Approx. 13 Liters (including a 3-liter reserve) 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycle safety is typically assessed through component performance and rider control rather than crash test ratings like cars). Active Features Active Features: High-performance braking system, responsive suspension, grippy tires. Passive Features Passive Features: Sturdy frame, protective fairings, rider ergonomics designed for control. Braking System Front Brake: Single 320 mm or 300 mm disc with four-piston radial caliper (e.g., Brembo or Nissin). Rear Brake: Single 220 mm disc with single-piston caliper. Brake Fluid: DOT 4 or DOT 5.1 brake fluid (refer to manual for specific type and change intervals). 💡 Technology Features Infotainment Infotainment System: N/A (Analog instrument cluster...