🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Year: 1999 Product Type: Service Repair Manual Product Format: Download 👋 Introduction Market Position Segment: Lightweight Sportbike / Performance Commuter Target Audience: Enthusiast riders, DIY mechanics, and performance-oriented users. Competitive Analysis Key Competitors: Yamaha YZF-R125, Suzuki GSX-R125, Honda CBR125R (though some models slightly later). Key Features Performance Focus: Known for its potent 125cc two-stroke engine and aggressive styling. Handling: Equipped with capable suspension and braking components for its class. Design: Emulates larger Aprilia RSV Mille sportbikes. 📋 Manual Details Coverage Areas All Service Repair: True Page Count Estimated Pages: Varies by specific edition, typically 200-400 pages for a comprehensive service manual. Manual Type Type: Service and Repair Manual Language Language: English Format Digital Format: PDF (likely) 📖 Manual Coverage Systems Covered Engine: Complete disassembly, inspection, repair, and assembly procedures for the Rotax 122 engine. Fuel System: Carburetor (Dell'Orto PHBH 28) tuning, cleaning, rebuilding, and fuel pump operation. Ignition System: CDI ignition system, spark plug selection, timing, and troubleshooting. Cooling System: Radiator, thermostat, coolant circulation, bleed procedures, and fan operation. Exhaust System: Expansion chamber, mufflers, and emission control systems. Transmission: Gearbox, clutch (hydraulically actuated), shift mechanism, and lubrication. Drivetrain: Chain drive, sprockets, and rear wheel hub. Suspension Front: Upside-down (USD) forks (e.g., Marzocchi, Paioli), oil type and level, seal replacement, damping adjustments. Suspension Rear: Monoshock rear suspension (e.g., Sachs), linkage system, shock absorber adjustment and rebuild. Brakes Front: Brembo dual piston calipers, brake disc specifications, master cylinder, brake fluid type and bleeding. Brakes Rear: Single piston caliper, brake disc specifications, master cylinder, brake fluid type and bleeding. Wheels Tires: Wheel bearings, tire pressures, rim specifications, and tire replacement. Electrical System: Wiring diagrams, battery maintenance, lighting, horn, starter motor, and fuses. Frame Chassis: Frame inspection, headstock bearings, swingarm pivot, and general chassis components. Bodywork: Fairing removal and installation, seat, fuel tank, and trim components. Procedures Included Routine Maintenance: Oil changes, chain lubrication and adjustment, air filter cleaning/replacement, spark plug checks. Troubleshooting: Diagnostic charts for common starting issues, running problems, and electrical faults. Engine Rebuild: Piston, ring, cylinder, crankshaft, and bearing replacement procedures. Suspension Service: Fork seal replacement, fork oil changes, shock absorber servicing. Brake Service: Brake pad replacement, caliper service, brake fluid flush and bleeding. Carburetor Tuning: Jetting adjustments, idle speed settings, mixture screw adjustments. Electrical Diagnostics: Using multimeters, checking continuity, identifying wiring faults. Clutch Adjustment: Hydraulic clutch free play adjustment. Winter Storage: Proper procedures for laying up the motorcycle for extended periods. Technical Depth Depth: Comprehensive, covering routine maintenance to full engine and chassis rebuilds. Detail Level: Detailed step-by-step instructions with torque specifications, tolerances, and diagrams. Diagnostic Tools: Information on required special tools and standard workshop tools. 📊 Manual Specifications File Format File Type: Likely PDF Searchability: Searchable text content for quick information retrieval. Print Quality Printability: Printable pages for workshop use. Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, two-stroke, single-cylinder Engine Manufacturer: Rotax Displacement: 124.8 cc Bore X Stroke: 54 mm x 54.5 mm Compression Ratio: 12.5:1 (approximate) Power Delivery: High-revving powerband typical of performance two-strokes. Performance Horsepower: Approximately 30-34 HP (Varies by market regulations and specific tuning) Torque: Approximate: 20-22 Nm at 9000 RPM Fuel System Carburetor: Dell'Orto PHBH 28 QD (with potential for upgrades) Fuel Type: Unleaded gasoline (min. 95 RON recommended) Oil Mixture: Automatic oil injection system (requires 2-stroke synthetic oil) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Clutch Type: Wet multi-plate, hydraulically operated Features Gear Ratios: Specific gear ratios are detailed within the manual for each gear. Final Drive: Chain drive Transmission Fluid: Specific gearbox oil type and capacity detailed in manual (typically SAE 80 or similar). 📐 Dimensions Exterior Length: Approx. 1950 mm Width: Approx. 730 mm Height: Approx. 1100 mm Wheelbase: Approx. 1350 mm Weights Dry Weight: Approx. 130 kg Fuel Capacity: Approx. 14 liters 🛡️ Safety Features Ratings Safety Standards: Compliant with European motorcycle safety standards for its era. Active Features Braking System: Powerful Brembo front brake and effective rear brake for confident stopping. Suspension: High-quality USD front forks and adjustable monoshock contribute to stability. Passive Features Lighting: Halogen headlight and LED taillight for visibility. Frame Construction: Robust aluminum twin-spar frame provides rigidity. 💡 Technology Features Infotainment Instrumentation: Analog tachometer, speedometer, odometer, trip meter, and essential warning lights. Driver Assistance ABS: ABS was not a standard feature on the 1999 RS 125. Connectivity Connectivity Features: No advanced electronic connectivity features typical of modern motorcycles. 🔧 Maintenance Service Intervals Oil Change: Refer to manual for specific mileage/time intervals, typically every 3,000-5,000 km or annually. Spark Plug Check: Check and clean/replace at regular intervals (e.g., every 5,000-7,500 km). Chain Maintenance: Lubricate and adjust chain every 500-1000 km, check for wear. Coolant Change: Flush and replace coolant every 2 years. Fork Oil...