🏷️ Basic Information Identification Make: Aprilia Model: SR 50 Year: 2004 Model Variant: Di-Tech (Direct Injection) Codes Engine Code: Minarelli 50LC (liquid-cooled) 👋 Introduction Market Position Segment: Performance scooter, sport scooter Target Audience: Enthusiasts, DIY mechanics, owners seeking cost savings on maintenance and repairs Competitive Analysis Key Competitors: Yamaha Aerox 50, Gilera Runner 50, Piaggio NRG 50 Key Features Unique Selling Points: Di-Tech direct injection engine offers better fuel economy and emissions compared to traditional 2-stroke carburetors; sporty handling and styling Manual Value Proposition: Empowers owners to perform maintenance and repairs, saving significant costs compared to dealership or professional shop labor. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive workshop and repair Page Count Estimated Pages: Likely 300-500+ pages (based on depth of coverage for professional manuals) Manual Type Type: Workshop Repair Manual / Service Manual Language Language: English (assumed for typical market availability, but often includes multiple languages) Format Format: Digital Download (PDF, compatible with PC, MAC, Tablets, Smartphones) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine disassembly, assembly, inspection, tuning, lubrication, cooling system, fuel injection system (Di-Tech), exhaust system Electrical System: Ignition system, starter motor, charging system, lighting, instrumentation, wiring diagrams, ECU diagnostics Drivetrain: Automatic transmission (CVT), clutch, variator, final drive Chassis And Suspension: Front fork (telescopic), rear shock absorber, swingarm, bearings, frame inspection Brakes: Front disc brake, rear disc brake (typically), hydraulic system, bleeding procedures, pad replacement Bodywork And Trim: Fairings, seat, storage, body panel removal and installation Fuel System: Fuel tank, fuel pump, fuel lines, injectors (Di-Tech) Cooling System: Radiator, coolant hoses, water pump, thermostat Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, spark plug service, drive belt inspection/replacement, brake fluid changes, coolant flushes Troubleshooting: System-by-system diagnostic procedures, common fault identification, solutions for performance issues, starting problems, electrical faults Repair: Detailed step-by-step instructions for component disassembly, repair, reassembly, and adjustment Rebuilds: Engine rebuild procedures, including torque specifications, clearances, and part tolerances Diagnostics: OBD-II (if applicable for this era/model), electronic diagnostic codes, sensor testing Technical Depth Depth: Full professional quality, in-depth service and repair Diagnostic Capabilities: Advanced diagnostics for electronic fuel injection (EFI) and engine control unit (ECU) Tuning Adjustments: Carburetor (if applicable to specific sub-models, though Di-Tech is FI), ignition timing, idle speed adjustments 📊 Manual Specifications File Format File Type: PDF Print Quality Resolution: High-resolution, suitable for printing Searchability: Text-searchable for quick information retrieval Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Type: Liquid-cooled, 2-stroke, single-cylinder Displacement: 49.3 cc Bore X Stroke: 39.3 mm x 40.2 mm (typical for Minarelli 50LC) Performance Horsepower: Approx. 6.5 - 7.5 HP (stock, varies by region and specific tune) Torque: Approx. 6.0 - 7.0 Nm (stock) Fuel System Injection Type: Electronic Fuel Injection (Di-Tech) Fuel Type: Unleaded gasoline (minimum 95 RON recommended) Oil Type: 2-stroke synthetic oil (specific API TC or JASO FD/FE rating) Lubrication System: Automatic oil injection Cooling System Type: Liquid-cooled 🔧 Transmission Standard Type: Automatic Continuously Variable Transmission (CVT) Features Variator Type: Automatic centrifugal clutch and variator Final Drive: Gear drive Fluid Specifications Final Drive Oil: SAE 80W-90 hypoid gear oil (typically 100-120ml capacity) 📐 Dimensions Exterior Length: Approx. 1750 mm (varies slightly by specific SR50 generation/trim) Width: Approx. 720 mm Height: Approx. 1150 mm Weights Dry Weight: Approx. 95 - 100 kg (varies by specific model/equipment) Gross Vehicle Weight Rating: Typically around 250 kg Cargo Storage: Under-seat storage compartment (often fits a full-face helmet) 🛡️ Safety Features Ratings Crash Test Results: N/A (Moped/Scooter classification typically not subject to automotive crash testing standards) Active Features Braking System: Dual hydraulic disc brakes (front and rear) for effective stopping power Lighting: Halogen headlight, LED tail light, turn signals Passive Features Frame Construction: Steel frame providing rigidity and rider support 💡 Technology Features Infotainment Instrument Cluster: Analog speedometer and tachometer, LCD display for fuel level, coolant temperature, odometer, clock. Some models may have a basic trip meter. Driver Assistance ABS: N/A (ABS was not standard or widely available on 50cc scooters in 2004) 🔧 Maintenance Service Intervals Engine Oil Change: Every 3,000 - 5,000 km or annually (for transmission/final drive) Air Filter Cleaning: Every 2,000 - 3,000 km, replace as needed Spark Plug Replacement: Every 4,000 - 6,000 km (or as recommended by plug manufacturer) Drive Belt Inspection: Every 5,000 - 7,000 km, replace as needed (or at 10,000 km regardless) Brake Fluid Flush: Every 2 years or as per manual recommendation Fluid Specifications Engine Oil Type: Full synthetic 2-stroke engine oil, meeting API TC or JASO FD/FE specifications. Brands like Motul, Castrol, or Agip are often recommended. Coolant Type: Ethylene glycol based coolant, mixed with distilled water (50/50 ratio). Antifreeze/anti-corrosion properties. Example: Agip Permanent or equivalent. Brake Fluid Type: DOT 4 hydraulic brake fluid Known Issues Common Faults: Di-Tech injector clogging, fuel pump issues, stator/rectifier failure, drive...