🏷️ Basic Information

Make:

Aprilia

Model:

SR50

Product Type:

Workshop Service Repair Manual

👋 Introduction

Segment:

Performance-oriented 50cc scooter, popular in urban environments and enthusiast communities.

Competitors:

Competes with other premium 50cc scooters from manufacturers like Piaggio (Zip, NRG), Yamaha (Jog, Aerox), and Gilera (Runner).

Engine Options:

Availability of both traditional carburetor and advanced ditech direct injection engines offers versatility.

Performance Focus:

Known for its sporty handling and acceleration, appealing to riders seeking a more engaging experience.

Target Audience:

DIY mechanics, scooter enthusiasts, and professional workshops seeking in-depth repair information.

📋 Manual Details

Engine:

Includes ditech engine variants

Gearbox Clutch:

Comprehensive coverage

Cooling System:

Detailed diagnosis and repair

Fuel System:

Includes fuel injection and carburetor systems

Braking System:

Front and rear brake systems, hydraulic components

Suspension:

Front fork and rear shock absorber service

Electrical System:

Wiring diagrams, component testing, battery, ignition

Body Fixtures:

Panel removal, seat, handlebars, lighting

Exhaust System:

Repair and maintenance

Wheels Tyres:

Tyre replacement, wheel balancing, rim service

Maintenance:

Routine checks, lubrication, filter replacement

Technical Information Specifications:

Torque values, clearances, general data

Estimated Pages:

Exact page count not specified, but described as 'Complete'

Type:

Workshop Service Repair Manual

Language:

Likely English, common for international manuals

Format:

Digital (PDF implied by product sales context)

📖 Manual Coverage

Engine Systems:

Internal engine components, lubrication, cooling, timing, fuel delivery (carburetor and ditech injection), exhaust.

Drivetrain Systems:

Automatic transmission (CVT), clutch assembly, variator, torque converter.

Braking Systems:

Hydraulic system, brake fluid, calipers, discs, master cylinders, levers, and associated lines.

Suspension Steering:

Front telescopic fork service, rear monoshock absorber, steering head bearings, and linkages.

Electrical Systems:

Battery, charging system (stator, regulator/rectifier), ignition system (CDI, spark plug), lighting (headlight, taillight, indicators), starting system (starter motor, solenoid), instrument cluster, wiring diagrams, diagnostic connectors.

Fuel Systems:

Fuel tank, fuel pump, fuel filter, fuel lines, carburetor (if applicable), ditech direct injection system (injectors, ECU, sensors).

Bodywork Chassis:

Frame, body panels, seat, storage compartment, fairings, handlebars, controls, kickstand, center stand.

Maintenance:

Oil changes, filter replacements (air, fuel, oil), spark plug replacement, brake fluid flush, coolant changes, valve clearance checks (if applicable to specific engine variations), lubrication points, battery maintenance.

Troubleshooting:

Diagnostic procedures for common starting, running, electrical, and braking issues. Fault code interpretation for ditech models.

Repair Rebuild:

Detailed step-by-step instructions for engine disassembly and reassembly, transmission component replacement, suspension overhaul, brake system repair, electrical component replacement.

Inspection:

Pre-ride checks, wear limit inspections for critical components (e.g., brake pads, tires, belts).

Adjustments:

Carburetor adjustment, throttle cable adjustment, brake lever adjustment, suspension preload adjustment.

Depth:

Comprehensive, covering routine maintenance to complete engine and component overhauls. Includes diagnostic procedures and troubleshooting trees.

Diagnostic Capabilities:

Detailed instructions for diagnosing electrical and engine performance issues, including specific tests for sensors and actuators.

Special Tools:

Lists and descriptions of specialized tools required for certain procedures (e.g., variator tool, clutch nut wrench).

📊 Manual Specifications

Format:

PDF (Portable Document Format) - allowing for searchability and easy navigation.

Quality:

Typically high-resolution, suitable for printing key sections or the entire manual.

Type:

N/A (Digital format)

Type:

N/A (Digital format)

Feature:

Searchable text for quick access to specific topics and keywords.

⚙️ Engine Specifications

Type:

Two-stroke, single-cylinder, liquid-cooled.

Displacement Cc:

Approximately 49cc (specific variations may exist).

Bore X Stroke Mm:

Typically around 39.5mm x 40.0mm, but varies by exact engine code.

Ditech Injection:

Direct fuel injection system (for ditech models) offering improved fuel efficiency and emissions.

Horsepower Hp:

Varies by market and year, generally in the range of 5-7 hp.

Torque Nm:

Specific torque figures depend on engine variant but are optimized for low-end acceleration.

Carburetor Spec:

Often equipped with a Dell'Orto carburetor (e.g., PHBN 17.5).

Injection System:

ECU-controlled direct injection system, potentially Magneti Marelli.

Ignition Type:

Electronic ignition (CDI).

🔧 Transmission

Transmission Type:

Automatic Continuously Variable Transmission (CVT).

Clutch Type:

Automatic centrifugal clutch.

Variator Operation:

Describes the operation and maintenance of the variator for optimal gear ratio changes.

Gear Oil:

SAE 80W/90 gear oil, approximately 0.1 liter capacity for the final drive.

📐 Dimensions

Length Mm:

Specific dimensions vary by generation, but typically around 1700-1800 mm.

Width Mm:

Typically around 700-750 mm.

Height Mm:

Typically around 1100-1150 mm.

Dry Weight Kg:

Generally in the range of 90-100 kg.

Fuel Tank Capacity Liters:

Typically around 7-8 liters.

🛡️ Safety Features

Crash Test Results:

N/A for scooters, safety focus is on handling, braking, and rider visibility.

Braking System:

Front disc brake, rear disc brake (often with hydraulic actuation).

Lighting:

Headlight, taillight, brake light, turn signals for visibility.

Frame Construction:

Steel frame designed for stability and rigidity.

Tyres:

Tubeless tires providing better puncture resistance.

💡 Technology Features

Instrument Cluster:

Digital/analog combination instrument cluster displaying speed, RPM, fuel level, turn signals, and warning lights.

ABS Availability:

ABS was an optional feature on some later models.

Diagnostic Port:

On-board diagnostic (OBD) port for electronic diagnostics on ditech models.

🔧 Maintenance

Engine Oil Change Km:

Every 3,000-5,000 km or annually, depending on usage (refer to specific model year recommendations).

Air Filter Replacement Km:

Every 6,000-10,000 km or as needed based on inspection.

Spark Plug Replacement Km:

Every 5,000-7,500 km or based on condition.

Brake Fluid Flush Years:

Every 2 years or as recommended by the manual.

Engine Oil Type:

API TC or JASO FD rated two-stroke mineral or synthetic oil (for oil injection models).

Cooling System Coolant:

Ethylene glycol-based antifreeze mixed with distilled water (50/50 ratio).

Brake Fluid Type:

DOT 4 hydraulic brake fluid.

Ditech Injection System:

Potential for injector clogging or fuel pump issues if poor quality fuel is used or maintenance is neglected.

Variator Rollers:

Wear on variator rollers can lead to poor acceleration and top speed. Regular inspection and replacement are recommended.

Electrical Connections:

Corrosion or loose connections in wiring harnesses can cause intermittent electrical faults.

📚 Vehicle History

Manufacturer:

Aprilia is an Italian manufacturer renowned for its performance-oriented motorcycles and scooters.

Generations:

The SR50 has undergone several significant updates, including the introduction of the ditech engine and various styling and chassis revisions.

Manufacturing Location:

Primarily manufactured in Italy.

Production Span:

The SR50 model line has been in continuous production for many years, with significant updates occurring through the late 1990s and 2000s.

🏆 Awards & Recognition

Market Perception:

The SR50 is generally well-regarded for its sporty character and handling within the 50cc scooter segment.