Segment:
        
        
            Mid-size scooter, popular for urban commuting and light touring.
        
     
    
    
        
            Key Competitors:
        
        
            Competed against models like the Yamaha X-MAX 125, Suzuki Burgman 125, and Honda SH125.
        
     
    
    
        
            Design Philosophy:
        
        
            Blends sporty Aprilia styling with practical scooter ergonomics, often featuring a liquid-cooled engine for better performance.
        
     
    
        
            Target Audience:
        
        
            Commuters seeking a stylish, reliable, and performant 125cc scooter with European flair.
        
     
 
    
    
    
        
            Primary Coverage:
        
        
            Comprehensive repair, maintenance, troubleshooting, and diagnostics for the Aprilia Leonardo 125.
        
     
    
        
            Secondary Coverage:
        
        
            Electrical system diagrams, component identification, torque specifications, special tool requirements.
        
     
    
    
        
            Estimated Pages:
        
        
            Typically 300-600 pages, depending on the specific edition and detail level.
        
     
    
    
        
            Type:
        
        
            Factory Service Manual / Workshop Manual
        
     
    
    
        
            Language:
        
        
            English (common for international markets)
        
     
    
    
        
            Format:
        
        
            Digital (PDF) - Searchable, printable, and often hyperlinked.
        
     
 
    
    
    
        
            Engine Mechanics:
        
        
            Detailed breakdown of engine components, including cylinder, piston, crankshaft, valves, timing system, lubrication, and cooling.
        
     
    
        
            Fuel System:
        
        
            Carburetor (or fuel injection on later models) tuning, cleaning, and overhaul; fuel pump, fuel lines, and filter service.
        
     
    
        
            Ignition System:
        
        
            Spark plug specifications, ignition timing, CDI unit, stator, and regulator/rectifier testing and replacement.
        
     
    
        
            Transmission Drivetrain:
        
        
            Automatic transmission (CVT) operation, belt inspection, roller weights, clutch assembly, and final drive servicing.
        
     
    
        
            Brakes:
        
        
            Front and rear brake system overhaul, caliper servicing, master cylinder, brake lines, fluid replacement, and bleeding procedures.
        
     
    
        
            Suspension:
        
        
            Front fork (telescopic) service, oil seals, damping adjustment, rear shock absorber inspection and replacement.
        
     
    
        
            Electrical System:
        
        
            Complete wiring diagrams, lighting system, starter motor, battery, charging system, fuse box, and instrument panel.
        
     
    
        
            Chassis Bodywork:
        
        
            Frame inspection, fairing removal and installation, seat, handlebars, and body panel adjustments.
        
     
    
        
            Cooling System:
        
        
            Radiator, fan, thermostat, coolant, and hose inspection and replacement for liquid-cooled models.
        
     
    
    
        
            Preventive Maintenance:
        
        
            Scheduled maintenance checks, fluid changes (oil, coolant, brake fluid), filter replacements, and lubrication points.
        
     
    
        
            Troubleshooting:
        
        
            Diagnostic flowcharts for common problems like starting issues, poor performance, and electrical faults.
        
     
    
        
            Engine Overhaul:
        
        
            Step-by-step instructions for engine disassembly, inspection of wear, component replacement, and reassembly.
        
     
    
        
            Brake System Repair:
        
        
            Detailed procedures for caliper rebuilding, master cylinder replacement, and brake line flushing.
        
     
    
        
            Electrical Diagnosis:
        
        
            Testing of sensors, actuators, and wiring harnesses using multimeters and specialized diagnostic tools.
        
     
    
        
            Suspension Tuning:
        
        
            Fork oil changes, seal replacement, and shock absorber adjustments.
        
     
    
        
            Carburetor Adjustment:
        
        
            Idle speed, mixture screw, and jetting adjustments for optimal performance and emissions.
        
     
    
        
            Cvt Servicing:
        
        
            Drive belt replacement, variator roller inspection, and clutch shoe replacement.
        
     
    
    
        
            Depth Level:
        
        
            Comprehensive, from basic maintenance to full engine and component rebuilds. Suitable for professional technicians and experienced DIY mechanics.
        
     
    
        
            Diagnostic Capabilities:
        
        
            In-depth troubleshooting guides for identifying and resolving mechanical and electrical faults.
        
     
    
        
            Special Tools:
        
        
            Lists and descriptions of Aprilia-specific tools required for certain repair procedures.
        
     
 
    
    
    
        
            Engine Type:
        
        
            Four-stroke, liquid-cooled, single-cylinder
        
     
    
    
        
            Bore X Stroke:
        
        
            Typically around 52 mm x 58.6 mm (specifics may vary slightly by sub-model).
        
     
    
        
            Compression Ratio:
        
        
            Around 11.0:1 to 12.0:1 (depending on specific engine variant).
        
     
    
    
        
            Horsepower:
        
        
            Approximately 15-16 HP (11-12 kW) at around 9,000 rpm.
        
     
    
        
            Torque:
        
        
            Around 12-13 Nm at approximately 7,000 rpm.
        
     
    
    
        
            Carburetion:
        
        
            Often a Mikuni or Keihin carburetor (e.g., CVK30 or similar) for earlier models; potentially electronic fuel injection (EFI) for later versions.
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline, 91-95 RON (Octane Rating).
        
     
    
    
        
            Cooling Method:
        
        
            Liquid Cooling with fan assistance.
        
     
    
    
        
            Oil Type:
        
        
            SAE 10W-40, API SG or higher, JASO MA certified motorcycle oil.
        
     
    
        
            Oil Capacity:
        
        
            Approx. 0.9 - 1.0 liters (check manual for precise figure).
        
     
 
    
    
    
        
            Length:
        
        
            Approximately 1900-2000 mm (check manual for precise figure).
        
     
    
        
            Width:
        
        
            Approximately 730-760 mm (at handlebars).
        
     
    
        
            Height:
        
        
            Approximately 1300-1350 mm (seat height).
        
     
    
        
            Wheelbase:
        
        
            Approximately 1300-1350 mm.
        
     
    
        
            Ground Clearance:
        
        
            Typically around 120-140 mm.
        
     
    
    
        
            Dry Weight:
        
        
            Approx. 140-150 kg.
        
     
    
        
            Wet Weight:
        
        
            Approx. 150-160 kg (with all fluids).
        
     
    
        
            Max Load Capacity:
        
        
            Typically around 150-180 kg (rider and passenger).
        
     
    
    
        
            Underseat Storage:
        
        
            Sufficient for one full-face helmet, or multiple smaller items. Often lockable.
        
     
    
        
            Additional Storage:
        
        
            May include a glove box or compartment in the leg shield.
        
     
 
    
    
    
        
            Dashboard Features:
        
        
            Analog speedometer and tachometer, fuel gauge, temperature gauge, odometer, trip meter, and indicator lights (turn signals, high beam, oil pressure, etc.).
        
     
    
    
        
            ABS Availability:
        
        
            ABS was an option on some later models, but not standard across all Leonardo 125 variants.
        
     
    
    
        
            Smartphone Integration:
        
        
            N/A (Technology of this era did not typically include smartphone integration).
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Every 4,000-6,000 km or annually, whichever comes first (refer to manual for exact specification).
        
     
    
        
            Air Filter Cleaning:
        
        
            Check every 4,000 km; clean or replace as needed. Replace every 12,000-16,000 km.
        
     
    
        
            Spark Plug Replacement:
        
        
            Inspect every 4,000 km; replace every 8,000-12,000 km.
        
     
    
        
            Cvt Belt Inspection:
        
        
            Inspect every 6,000 km; replace as needed, typically between 18,000-24,000 km depending on usage.
        
     
    
        
            Brake Fluid Flush:
        
        
            Every 2 years, or as specified by the manual.
        
     
    
    
        
            Engine Oil Spec:
        
        
            SAE 10W-40, API SG or higher, JASO MA.
        
     
    
        
            Coolant Type:
        
        
            Ethylene glycol based antifreeze coolant with corrosion inhibitors, mixed 50/50 with distilled water.
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 4 hydraulic brake fluid.
        
     
    
    
        
            Common Wear Items:
        
        
            CVT belt, variator rollers, brake pads, tires, and the voltage regulator/rectifier can be common wear items.
        
     
    
        
            Potential Faults:
        
        
            Carburetor gumming if not used regularly, potential electrical connector corrosion, and cooling system leaks are possibilities.
        
     
    
        
            Diagnostic Focus Areas:
        
        
            The manual would guide diagnostics for issues related to cold starting, erratic idling, overheating, or charging system failures.
        
     
 
    
    
    
        
            Manufacturer History:
        
        
            Aprilia is an Italian manufacturer with a strong heritage in racing and performance motorcycles and scooters.
        
     
    
    
        
            Launch Period:
        
        
            The Leonardo line was introduced in the late 1990s, with the 125cc model being a key player in the European market.
        
     
    
        
            Updates:
        
        
            Likely saw updates in styling, engine technology (e.g., introduction of fuel injection), and possibly braking systems over its production run.
        
     
    
    
        
            Manufacturing Origin:
        
        
            Primarily manufactured in Italy.
        
     
    
        
            Production Years:
        
        
            Broadly from late 1990s through the early to mid-2000s, though exact model years covered by the manual may vary.