🏷️ Basic Information Identification Make: Aprilia Model: SR 50 Year: 1995 Product Type: Full Service Repair Manual 👋 Introduction Market Position Segment: High-performance 50cc scooter segment, popular in European markets. Competitive Analysis Competitors: Competed with models like the Piaggio Zip SP, Gilera Runner, and Yamaha BW's 50. Key Features Performance Orientation: Known for its sporty handling and relatively powerful engine for its class. Design Appeal: Sporty, aggressive styling that appealed to younger riders. 📋 Manual Details Coverage Areas Primary Coverage: Complete repair, maintenance, and overhaul of the Aprilia SR 50 scooter. Page Count Estimated Pages: 300+ Manual Type Type: Service Manual / Workshop Manual Language Language: English Format Format: Digital (PDF assumed, can be printed) 📖 Manual Coverage Systems Covered Engine Overhaul: Detailed procedures for engine disassembly, inspection, assembly, and tuning. Fuel System: Carburetor tuning, cleaning, and rebuilding; fuel tank and line maintenance. Ignition System: Spark plug specifications, ignition coil testing, CDI unit diagnostics. Cooling System: Radiator, water pump, thermostat, and coolant flow checks (for liquid-cooled variants). Transmission Drivetrain: Automatic CVT (Continuously Variable Transmission) inspection, belt replacement, clutch and variator maintenance. Brakes: Front and rear brake system overhaul, fluid replacement, pad/shoe inspection and replacement, caliper servicing. Suspension Steering: Front fork servicing (oil change, seal replacement), rear shock absorber inspection, steering head bearing maintenance. Electrical System: Wiring diagrams, battery maintenance, lighting system checks, starter motor and charging system diagnostics. Bodywork Chassis: Panel removal and installation, seat adjustment, fairing repairs, chassis lubrication. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, drive belt inspection, general lubrication. Troubleshooting Diagnostics: Step-by-step guides for identifying and resolving common performance issues and malfunctions. Rebuilds Restorations: Comprehensive instructions for complete engine rebuilds, transmission overhauls, and chassis restoration. Adjustments Tuning: Carburetor jetting, idle speed adjustment, brake lever free play, suspension sag. Technical Depth Depth Level: Expert-level; suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format File Type: PDF Print Quality Resolution: High-resolution scans for clear text and diagrams. Binding Type Binding: N/A (Digital format) Paper Type Paper Quality: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, single-cylinder, liquid-cooled (common variant). Displacement: 49cc (approx. 50cc class) Bore X Stroke: 39.0 mm x 41.4 mm (typical for Hi-Per engine) Compression Ratio: 10.0:1 (typical) Performance Horsepower: Approx. 6-7 HP @ 7000 RPM (depending on tuning and market restrictions) Torque: Approx. 7 Nm @ 6500 RPM (typical) Fuel System Carburetor Model: Dell'Orto PHVA 17.5 DD (common fitment). Fuel Type: Unleaded Gasoline (95 RON recommended) Oil Mixture: Premixed fuel and 2-stroke oil, or via automatic oil injection system. 🔧 Transmission Standard Type: Automatic CVT (Continuously Variable Transmission) Clutch Type: Centrifugal automatic clutch Features Variator: Equipped with a variator for seamless gear ratio changes. Drive Belt: Requires specific Aprilia drive belt for optimal performance and durability. 📐 Dimensions Exterior Length: Approx. 1750 mm Width: Approx. 730 mm Height: Approx. 1160 mm Weights Dry Weight: Approx. 95 kg Max Load: Approx. 150 kg (including rider and cargo) 🛡️ Safety Features Ratings Crash Test Info: Not typically tested in formal crash safety ratings like automobiles. Active Features Braking System: Disc brakes front and rear for effective stopping power. Lighting: Headlight, taillight, brake lights, and turn signals for visibility. Passive Features Frame Construction: Steel tubular frame for structural integrity. 💡 Technology Features Infotainment Dashboard Features: Analog speedometer, odometer, fuel gauge, turn signal indicators, high beam indicator. Driver Assistance ABS Availability: ABS was not a common feature on 50cc scooters of this era. Connectivity Connectivity Options: None (basic mechanical and electrical systems). 🔧 Maintenance Service Intervals Engine Oil Change: Every 3,000 km or annually, whichever comes first (check manual for specific grade). Drive Belt Inspection: Every 5,000 km; replacement recommended around 10,000-15,000 km depending on wear. Spark Plug Replacement: Every 5,000 km or as needed based on condition. Air Filter Cleaning: Every 3,000 km; replace as needed. Coolant Flush: Every 2 years or 20,000 km (for liquid-cooled models). Fluid Specifications Engine Oil Grade: API TC-W3 or JASO FD certified 2-stroke engine oil (premix). Gearbox Oil Type: SAE 75W/90 GL-4 or GL-5 gear oil (capacity ~100 ml). Coolant Type: Ethylene glycol based antifreeze with corrosion inhibitors (50/50 mix with distilled water). Brake Fluid Type: DOT 4 brake fluid. Known Issues Carburetor Clogging: Common issue with older scooters due to fuel residue; requires regular cleaning. Variator Wear: Variator rollers and guides can wear, affecting acceleration and top speed. Cooling System Leaks: Hoses and seals in the liquid-cooled system can degrade over time, leading to leaks. Electrical Connectors: Corrosion on electrical connectors can lead to intermittent faults. 📚 Vehicle History Brand Heritage Manufacturer: Aprilia, an Italian manufacturer renowned for its performance motorcycles and scooters. Model Evolution Sr Series Legacy: The SR 50 line has a long history of sporty 50cc scooters, dating back to earlier models like the SR 50 Stealth. 1995...