🏷️ Basic Information Identification Make: Aprilia Model: SR 50 Year: 1998 Codes Chassis Code: AP05W Engine Code Range: May vary, typically 2-stroke Piaggio engine 👋 Introduction Market Position Segment: Sport Scooter Competitive Analysis Competitors 1998: Piaggio Zip SP, Gilera Runner 50, Yamaha Aerox 50, Malaguti F12 Phantom Key Features Vehicle Appeal: Sporty styling, agile handling, energetic performance for its class, customisation potential. Manual Value Proposition Purpose: Empowers owners and technicians with the knowledge to maintain, repair, and restore the Aprilia SR 50 (1998) to peak condition. 📋 Manual Details Coverage Areas Systems Covered: Engine, Fuel System, Ignition System, Cooling System, Transmission (CVT), Chassis, Suspension, Brakes, Electrical System, Bodywork, Troubleshooting Page Count Estimated Pages: 200-300 Manual Type Type: Full Service Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, repair, and reassembly procedures. Fuel System Diagnostics: Carburetor tuning, fuel line inspection, fuel filter replacement, fuel pump (if applicable) testing. Cooling System Maintenance: Coolant flushing and refilling, radiator inspection, water pump seal replacement. Transmission Service: CVT belt replacement, clutch operation, variator service, gearbox oil change. Electrical System Schematics: Wiring diagrams for lighting, ignition, starting, charging, and instrumentation. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug service, lubrication points. Troubleshooting Guides: Step-by-step diagnostic procedures for common problems, error codes, and symptoms. Component Rebuilds: Detailed instructions for rebuilding carburetors, brake calipers, suspension components, and more. Chassis Adjustments: Steering head bearing adjustment, suspension tuning, alignment checks. Bodywork Repair: Panel removal and installation, fairing repair, seat maintenance. Technical Depth Depth: Comprehensive, covering everything from basic maintenance to complete engine and chassis rebuilds. 📊 Manual Specifications File Format File Type: PDF Print Quality Resolution: High-resolution, optimized for printing. Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) Searchability Text Search: Yes, searchable PDF content. ⚙️ Engine Specifications Primary Engine Type: 2-Stroke, Single Cylinder Cooling Method: Liquid-Cooled Displacement: 49.3 cc Bore X Stroke: 39.5 mm x 40.1 mm Compression Ratio: Approx. 8.4:1 Performance Horsepower Rated: Approx. 5.7 - 6.0 HP @ 7,000 RPM (stock) Torque Rated: Approx. 6.0 Nm @ 6,500 RPM (stock) Fuel System Carburetor: Dell'Orto PHVA 12 (or similar 12mm carb) Fuel Type: Unleaded Gasoline (95 RON recommended) Oil Mixing: Automatic Oil Injection (separate oil reservoir) 🔧 Transmission Standard Type: Automatic CVT (Continuously Variable Transmission) Optional Variations: N/A (CVT is standard) Features Clutch: Centrifugal clutch Final Drive: Geared (reduction gearbox) Fluid Type Gearbox Oil: SAE 80W/90 API GL-3 or GL-4 gear oil Fluid Capacity Gearbox Oil Capacity: Approx. 120-150 ml 📐 Dimensions Exterior Length: Approx. 1800 mm Width: Approx. 700 mm Height: Approx. 1150 mm Weights Dry Weight: Approx. 95-100 kg Gross Vehicle Weight Rating: Approx. 250 kg Cargo Underseat Storage: Yes, typically fits one full-face helmet. 🛡️ Safety Features Ratings Crash Test Data: N/A (Scooter, not subjected to automotive crash tests) Active Features Braking System: Front: Disc brake (e.g., 190mm), Rear: Drum brake (or optional disc) Lighting: Halogen headlight, taillight, turn signals Passive Features Frame Construction: Steel tube frame Wheels Tires: Front: 130/60-13, Rear: 130/60-13 (typical) 💡 Technology Features Infotainment Instrument Cluster: Analog speedometer, fuel gauge, indicator lights, possibly a small digital clock. Driver Assistance Advanced Features: N/A (Basic mechanical controls) 🔧 Maintenance Service Intervals Oil Change Engine: N/A (2-stroke, oil mixed with fuel or injected) Gearbox Oil Change: Every 5,000 - 10,000 km or annually Spark Plug Service: Every 3,000 - 5,000 km, or as needed Air Filter Cleaning: Every 2,000 - 4,000 km, or as needed depending on conditions Cvt Belt Inspection: Every 5,000 - 8,000 km for wear and tear Fluid Specifications 2 Stroke Oil: High-quality JASO FD or ISO-L-EGD certified 2-stroke engine oil (pre-mix or injection) Coolant: Ethylene glycol based coolant with anti-corrosion additives (e.g., Piaggio branded or equivalent) Known Issues Common Wear Items: CVT belt, variator rollers, brake pads/shoes, spark plug, carburetor jets, suspension bushings. Potential Problems: Carburetor gumming if fuel is left standing, electrical connection corrosion, exhaust port carbon build-up, stator coil failure. 📚 Vehicle History Brand Heritage Company Origin: Italian manufacturer founded in 1945, renowned for motorcycles and scooters. Model Evolution Sr 50 Generations: The 1998 model is part of the first generation of the SR 50, evolving from earlier Aprilia scooter designs. Successive generations introduced new styling and engine options (e.g., Piaggio LEADER engine). Production Manufacturing Location: Italy 🏆 Awards & Recognition Recognitions Historical Awards: While specific awards for the '98 SR 50 are not widely documented, Aprilia scooters have historically been recognized for their performance and sporty design in their class.