🏷️ Basic Information Identification Make: Aprilia Model: SR 50 Year: 2004 Product Type: Full Service Repair Manual 👋 Introduction Market Position Segment: Sport Scooter, popular in urban environments for its sporty styling and performance. Competitive Analysis Competitors: Competes with other 50cc sport scooters from brands like Yamaha (BWs, Aerox), Piaggio (Zip, NRG), and Peugeot (Speedfight). Key Features Appeal: Known for its agile handling, aggressive styling, and capable engine for its class, making it a favorite among younger riders and urban commuters. 📋 Manual Details Coverage Areas Comprehensive Coverage: Repair, Maintenance, Rebuilding, Refurbishing, Restoration Page Count Estimated Page Count: Highly detailed, exceeding 200 pages (typical for comprehensive repair manuals) Manual Type Type: Service Repair Manual Language Language: English Format Format: Digital (likely PDF, often provided as a downloadable file for sales) 📖 Manual Coverage Systems Covered Engine: Detailed engine disassembly, assembly, tuning, component diagnosis, and repair procedures for the specific 2004 SR 50 engine variants. Fuel System: Carburetor (likely Dell'Orto PHBN 12/17.5 series) adjustment, cleaning, and rebuilding; fuel pump operation; fuel line routing and inspection. Ignition System: CDI unit diagnosis, spark plug specifications, timing adjustments, and troubleshooting. Transmission: Automatic CVT (Continuously Variable Transmission) service, including variator and clutch disassembly, inspection, component replacement, and belt maintenance. Cooling System: Liquid cooling system maintenance, radiator service, coolant type and capacity, water pump inspection, and thermostat operation. Brakes: Front and rear brake system service, including hydraulic fluid type and bleeding procedures, caliper maintenance, disc inspection, and pad replacement. Suspension: Front telescopic fork service, rear shock absorber inspection and replacement, and linkage maintenance. Electrical System: Wiring diagrams, lighting system diagnostics, starter motor and battery maintenance, fuse box layout, and component testing. Bodywork And Chassis: Frame inspection, body panel removal and installation, seat servicing, and fairing repair. Wheels And Tires: Tire pressure specifications, wheel bearing maintenance, and rim inspection. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug service, air filter cleaning/replacement, brake fluid checks, and general inspections. Troubleshooting: Systematic diagnostic guides for common starting issues, performance problems, electrical faults, and braking inefficiencies. Engine Rebuild: Step-by-step instructions for complete engine disassembly, piston and cylinder inspection/replacement, crankshaft and bearing service, and reassembly. Transmission Overhaul: Detailed procedures for variator roller replacement, clutch shoe inspection/replacement, and torque driver service. Electrical Diagnostics: Wiring diagram interpretation, component testing using multimeters, and fault finding for lighting, charging, and starting systems. Brake Bleeding: Proper procedures for hydraulic brake system bleeding to ensure optimal braking performance. Suspension Servicing: Fork oil replacement, seal inspection, and rear shock absorber mounting procedures. Technical Depth Depth Level: Comprehensive, covering everything from basic scheduled maintenance to complete engine and transmission overhauls, including detailed electrical troubleshooting. 📊 Manual Specifications File Format File Type: Digital (PDF assumed) for ease of access and searching. Print Quality Clarity: High-resolution scans or professionally formatted digital documents ensuring clear diagrams and text. Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, single-cylinder, liquid-cooled. Displacement: 49.3 cc (cubic centimeters) Bore X Stroke: 39.0 mm x 41.4 mm (typical for this engine) Cooling Method: Liquid-cooled Compression Ratio: Approximately 7.4:1 (subject to engine variant and tuning) Performance Horsepower Output: Approx. 5.0 - 6.0 HP (depending on tuning and emissions regulations) Torque Output: Approx. 4.0 - 4.5 Nm (depending on tuning) Fuel System Carburetor Model: Likely Dell'Orto PHBN 12/17.5 or similar. Fuel Delivery: Carburetor with electric choke, gravity fed from fuel tank. Fuel Type: Unleaded gasoline (RON 95 recommended) Oil Mixing: Automatic oil injection system (separate oil reservoir). 🔧 Transmission Standard Transmission Type: Automatic CVT (Continuously Variable Transmission) Drive Type: Belt drive to rear wheel. Features Variator Rollers: Replaceable rollers, specific weight and diameter crucial for performance. Clutch Type: Centrifugal clutch with clutch shoes. 📐 Dimensions Exterior Length: Approx. 1830 mm Width: Approx. 710 mm Height: Approx. 1130 mm Wheelbase: Approx. 1275 mm Weights Dry Weight: Approx. 95 kg (curb weight may vary) Max Load Capacity: Typically around 100-120 kg including rider. 🛡️ Safety Features Ratings Crash Safety: No formal crash test ratings like cars; safety relies on rider skill and maintenance of braking/handling systems. Active Features Braking System: Front: Hydraulic disc brake (typically 190mm); Rear: Hydraulic disc brake (typically 190mm). ABS was not standard on this model. Lighting: Headlight, taillight, brake lights, turn signals for visibility. Passive Features Frame Construction: Steel tube frame designed for rigidity and handling. Tires: Tubeless sport-scooter tires, typically sized 120/70-13 front and rear. 💡 Technology Features Infotainment Instrument Cluster: Analog speedometer and tachometer, fuel gauge, coolant temperature gauge, indicator lights. Driver Assistance ABS: Not standard on the 2004 model. Availability may vary by specific market. Connectivity Connectivity Features: N/A (typical for a 2004 50cc scooter). 🔧 Maintenance Service Intervals Engine Oil Change: Every 3,000 - 5,000 km or annually (check manual for exact interval). Transmission Oil Change: Gear oil in the final...