Vehicle Segment:
        
        
            Sport Scooter (125cc category)
        
     
    
    
        
            Key Competitors:
        
        
            Piaggio NRG, Aprilia SR, Yamaha Aerox, Malaguti F12 (within the 125cc sport scooter segment of the early 2000s).
        
     
    
    
        
            Design Philosophy:
        
        
            Designed for sporty performance and agile handling, often with a focus on aggressive styling and performance-oriented components.
        
     
    
    
        
            Target User:
        
        
            DIY enthusiasts, home mechanics, professional technicians seeking detailed repair and maintenance information.
        
     
 
    
    
    
        
            Engine Mechanical:
        
        
            Engine overhaul, top-end rebuild (cylinder head, piston, rings), bottom-end rebuild (crankshaft, connecting rod, bearings), valve adjustment, timing chain replacement, lubrication system, cooling system.
        
     
    
        
            Fuel System:
        
        
            Fuel injection system (throttle body, injectors, sensors), fuel pump, fuel filter, fuel tank, carburetor (if applicable to specific sub-models/regions within this range).
        
     
    
        
            Ignition System:
        
        
            CDI unit, ignition coil, spark plug, stator, wiring diagrams for ignition.
        
     
    
        
            Transmission Drivetrain:
        
        
            Automatic Transmission (CVT) - clutch, variator, drive belt, torque converter, gear reduction unit, lubrication.
        
     
    
        
            Brakes:
        
        
            Front and rear brake system servicing (disc brakes), brake fluid replacement, caliper overhaul, master cylinder servicing, brake hose inspection and replacement, ABS system troubleshooting (if equipped).
        
     
    
        
            Suspension Steering:
        
        
            Front fork (telescopic) overhaul, rear shock absorber replacement, steering head bearing service, swingarm maintenance.
        
     
    
        
            Electrical System:
        
        
            Starter motor, battery, charging system (alternator/stator), lighting (headlights, taillights, indicators), horn, dashboard instrumentation, wiring diagrams, troubleshooting electrical faults.
        
     
    
        
            Chassis Bodywork:
        
        
            Frame inspection, body panel removal and installation, seat removal, fairing components, lighting assembly, storage compartment access.
        
     
    
    
        
            Routine Maintenance:
        
        
            Oil changes, filter replacements (oil, air), spark plug replacement, coolant checks and top-up, brake fluid checks, tire pressure checks, drive belt inspection.
        
     
    
        
            Troubleshooting:
        
        
            Diagnostic procedures for common issues, symptom-based troubleshooting guides, electrical fault finding, engine performance problems.
        
     
    
        
            Repair Overhaul:
        
        
            Step-by-step instructions for component disassembly, repair, and reassembly of all major vehicle systems.
        
     
    
        
            Diagnostic Tools:
        
        
            Information on specific diagnostic tools or methods recommended for the vehicle.
        
     
    
    
        
            Depth:
        
        
            Comprehensive, covering basic to advanced repairs, including engine rebuilding and detailed electrical diagnostics.
        
     
 
    
    
    
    
    
        
            Printability:
        
        
            Printable (single pages or entire manual)
        
     
    
    
        
            Binding:
        
        
            Digital Download (No physical binding)
        
     
    
    
        
            Paper Type:
        
        
            N/A (Digital format)
        
     
    
    
        
            Device Compatibility:
        
        
            Windows and MAC computers, tablets, and smartphones.
        
     
    
    
        
            Usage License:
        
        
            Lifetime use, no expiry dates, usable on multiple devices.
        
     
 
    
    
    
        
            Engine Type:
        
        
            4-stroke, liquid-cooled, single-cylinder
        
     
    
        
            Displacement:
        
        
            124 cc (cubic centimeters)
        
     
    
    
        
            Horsepower Range:
        
        
            Approximately 14-15 HP (subject to specific regional regulations and tuning)
        
     
    
        
            Torque Range:
        
        
            Approximately 10-11 Nm (subject to specific regional regulations and tuning)
        
     
    
    
        
            Fuel Delivery:
        
        
            Electronic Fuel Injection (EFI) - typically Piaggio's PFI system for this era.
        
     
    
    
        
            Bore X Stroke:
        
        
            Approx. 52 mm x 58.6 mm (typical for Piaggio LEADER 125 engine)
        
     
    
    
        
            Cooling Type:
        
        
            Liquid-cooled with radiator and fan
        
     
    
    
        
            Oil Type:
        
        
            Synthetic 4-stroke motorcycle oil, e.g., API SG/SH/SJ or higher, JASO MA, viscosity typically 5W-40 or 10W-40. (Refer to manual for exact specification)
        
     
    
    
        
            Valve Train:
        
        
            2-valve SOHC (Single Overhead Camshaft)
        
     
 
    
    
    
        
            Dashboard Display:
        
        
            Analog speedometer, digital odometer, fuel gauge, engine temperature gauge, indicator lights (turn signals, high beam, oil pressure).
        
     
    
    
        
            ABS Availability:
        
        
            Optional on some models/regions.
        
     
    
    
        
            Connectivity Features:
        
        
            N/A (No modern connectivity features like Bluetooth or smartphone integration on this model).
        
     
 
    
    
    
        
            Engine Oil Change:
        
        
            Every 5,000 - 7,000 km or annually, whichever comes first (refer to manual for exact interval).
        
     
    
        
            Air Filter Cleaning Replacement:
        
        
            Clean every 5,000 km, replace as needed or every 10,000 km.
        
     
    
        
            Spark Plug Replacement:
        
        
            Every 10,000 - 15,000 km (depending on plug type).
        
     
    
        
            Drive Belt Inspection Replacement:
        
        
            Inspect every 5,000 km, replace every 15,000 - 20,000 km or if wear is evident.
        
     
    
    
        
            Brake Fluid Type:
        
        
            DOT 4 (refer to manual for exact specification and bleeding procedure).
        
     
    
        
            Coolant Type:
        
        
            Ethylene glycol based antifreeze, typically a 50/50 mix with distilled water. (Refer to manual for exact specification).
        
     
    
    
        
            Common Wear Items:
        
        
            Variator drive belt, front fork seals, brake pads, suspension bushings.
        
     
    
        
            Electrical Gremlins:
        
        
            Wiring harness issues (corrosion, chafing) can occur with age and mileage, affecting lights or starting systems. Battery and charging system health are crucial.
        
     
    
        
            Engine Performance Degradation:
        
        
            Loss of power can be due to worn variator rollers, old drive belt, clogged fuel injectors, or valve clearance issues.
        
     
 
    
    
    
        
            Manufacturer Origins:
        
        
            Gilera is an Italian motorcycle manufacturer with a long history dating back to 1909, known for performance-oriented scooters and motorcycles.
        
     
    
    
        
            Runner Lineage:
        
        
            The Gilera Runner series is a long-standing and popular range of sporty scooters, characterized by its dynamic styling, capable chassis, and performance-oriented engines. The VX125 represents a significant iteration within this lineage.
        
     
    
    
        
            Manufacturing Location:
        
        
            Primarily Italy (Piaggio Group manufacturing facilities)