The Runner Purejet 50, produced for the 2003-2004 model years, represents a sporty and agile option in the 50cc scooter segment. Known for its aggressive styling and the advanced Purejet 50cc direct injection 2-stroke engine, this model offers enhanced performance and fuel efficiency compared to its carbureted predecessors. An Italian brand with a rich heritage in performance motorcycling, engineered the Runner series for dynamic handling and a responsive riding experience, making it a popular choice for urban commuting and spirited riding. This comprehensive service repair workshop manual provides detailed guidance for owners and technicians working on the Runner Purejet 50cc (Fuel Injection) models from 2003 and 2004. It covers a vast array of systems, including complete engine service, fuel injection, ignition, cooling, transmission, brakes, suspension, steering, and electrical systems. The manual includes routine maintenance procedures, troubleshooting guides for common issues, step-by-step repair instructions, diagnostic procedures, and essential technical specifications, all presented with clarity to ensure proper upkeep and repair of the vehicle. 🏷️ Basic Information Identification Make: Gilera Model: Runner Purejet 50 Year: 2003-2004 👋 Introduction Market Position Scooter Segment: Sporty 50cc scooter segment, popular in urban environments Competitive Analysis Key Competitors: Aprilia SR50, Piaggio Zip SP, Yamaha Aerox 50, Malaguti F12R Key Features Engine Technology: Purejet 50cc direct injection 2-stroke engine, offering improved performance and fuel efficiency over carbureted models Design: Aggressive, sporty design with advanced features for its class 📋 Manual Details Coverage Areas Model Years Covered: 2003, 2004 Engine Variants Covered: Purejet 50cc (Fuel Injection) Page Count Estimated Page Count: Hundreds of pages (specific number not provided, but described as extensive) Manual Type Manual Type: Service Repair Workshop Manual Language Language: English (implied by product description, common for international manuals) Format Digital Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Service: Complete overhaul, disassembly, assembly, tuning, and component diagnostics Fuel System: Detailed coverage of the Purejet fuel injection system, including components, testing, and calibration Ignition System: Spark plug specifications, ignition coil testing, CDI unit diagnostics Cooling System: Radiator, water pump, thermostat, coolant type, and bleeding procedures Exhaust System: Catalytic converter information, silencer, and header pipe maintenance Transmission And Drivetrain: CVT (Continuously Variable Transmission) disassembly, component inspection (variator, clutch, belt), and lubrication Brakes: Front and rear brake system service, hydraulic lines, caliper maintenance, pad replacement, and bleeding Suspension: Front telescopic forks, rear shock absorber service, and adjustment procedures Steering: Handlebar, steering stem, and bearing maintenance Electrical System: Wiring diagrams, lighting, battery, starter motor, charging system, and ECU diagnostics Bodywork And Chassis: Panel removal, fairing maintenance, seat and storage compartment service Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, brake fluid flushes, and general inspections Troubleshooting: Diagnostic procedures for common starting, running, and electrical issues Repair Procedures: Step-by-step guides for component replacement and repair across all covered systems Diagnostic Guides: Fault code interpretation and systematic diagnostic flowcharts for the Purejet system Wiring Diagrams: Comprehensive electrical schematics for accurate troubleshooting Exploded Diagrams: Highly detailed visual aids for part identification and assembly sequence Technical Depth Depth Of Coverage: Professional-level repair and overhaul, suitable for experienced DIY mechanics and technicians 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable PDF, enhancing usability for finding specific information Print Quality Print Capability: Printable pages (single or entire manual) Binding Type Digital Binding: N/A (Digital Download) Paper Type Digital Paper Type: N/A (Digital Download) Licensing Usage License: Lifetime use, unlimited computer installations ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, liquid-cooled, Piaggio Hi-Per 2 Pro (Purejet) Displacement: 49.4 cc (3.01 cu in) Bore X Stroke: 39 mm x 41.4 mm (typical for this engine family) Performance Horsepower: Approximately 4.5 - 5.0 HP (stock, subject to variations) Torque: Specific torque figures not commonly published for 50cc scooters, but optimized for urban acceleration Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) with digital ignition Recommended Fuel: Unleaded Gasoline (Octane rating 95 RON recommended) Lubrication Oil System: Automatic oil injection system (separate reservoir for 2-stroke oil) Recommended 2T Oil: High-quality, low-smoke, fully synthetic 2-stroke scooter oil 🔧 Transmission Standard Transmission Type: Automatic Continuously Variable Transmission (CVT) Features Gear Reduction: Integrated final drive with helical gears Transmission Fluid: N/A (CVT does not use a transmission fluid in the automotive sense; requires occasional inspection and replacement of belt and rollers) 📐 Dimensions Exterior Wheelbase: Approximately 1350 mm (135 cm) Weights Dry Weight: Approximately 105 kg Max Payload: Typically around 150 kg (rider + passenger + cargo) 🛡️ Safety Features Ratings Crash Test Results: Not applicable for this vehicle class and era in standard automotive crash testing protocols. Active Features Braking System: Hydraulic disc brakes front and rear Lighting: Halogen headlamp, taillight, brake light, turn signals Passive Features Frame Construction: Steel tube frame 💡 Technology Features Infotainment Instrument Cluster: Analog speedometer, digital odometer, fuel gauge, coolant temperature warning light, and indicator lights. Driver Assistance ABS:...