🏷️ Basic Information

Make:

Derbi

Model:

GPR 50 Racing

Model Variant:

Racing

Year Range Covered:

2004-2005

Chassis Code:

Specific chassis codes are not provided in product information, but typically vary by region and specific production batch.

Engine Code:

Specific engine codes are not provided in product information, but typically relate to the Piaggio/Minarelli AM6 engine family.

👋 Introduction

Market Position:

The Derbi GPR 50 Racing was positioned as a premium 50cc sport motorcycle, targeting younger riders and those seeking a stylish, performance-oriented entry into motorcycling, often mimicking the aesthetics of larger sportbikes.

Competitive Analysis:

Competed against other 50cc sportbikes from brands like Aprilia (RS 50), Yamaha (TZR 50), and Gilera (GSM 50), as well as other performance-oriented mopeds and scooters of the era. Its appeal lay in its aggressive styling and handling characteristics, often considered superior to more utilitarian moped designs.

Key Features:

Distinctive racing-inspired fairings, capable chassis and suspension, powerful for its class (often utilizing a Piaggio/Minarelli AM6 engine), digital instrument cluster on some variants, and an aggressive riding posture.

📋 Manual Details

Coverage Areas:

Mechanical components, electrical systems, bodywork, chassis, and accessories for Derbi GPR 50 Racing models 2004-2005.

Page Count:

Exact page count not specified, but typically extensive for a parts catalog covering multiple assemblies.

Manual Type:

Parts Catalogue / Microfiche

Language:

Likely English or multilingual, common for European vehicle documentation. Specific language not stated.

Format:

PDF

📖 Manual Coverage

Systems Covered:

Engine assembly, cylinder and piston, crankshaft, gearbox, clutch, cooling system, fuel system (carburetor, fuel tank), exhaust system, ignition system, electrical system (wiring harness, lighting, instruments), frame, front suspension (forks), rear suspension (shock absorber, swingarm), brakes (front and rear calipers, master cylinders, discs), wheels, tires, body panels (fairings, seat, tank cover), controls (handlebars, levers), and accessories.

Procedures Included:

Identification of individual components, assembly diagrams for various sub-systems, visual guides for disassembly and reassembly of mechanical and electrical parts. Wiring diagram is included, aiding in electrical troubleshooting and repair.

Technical Depth:

Detailed visual cataloging of all parts. While not a repair manual in the procedural sense, it provides the necessary visual information (assembly/disassembly illustrations) to understand how components fit together and to identify correct replacement parts. It facilitates parts identification and ordering, crucial for repair and maintenance planning.

📊 Manual Specifications

File Format:

PDF

Print Quality:

GOOD QUALITY & FULLY PRINTABLE

Binding Type:

Digital PDF - printable pages

Paper Type:

Not applicable (digital format); printable on standard paper types.

Searchability:

Likely searchable if the PDF is text-based, though image-heavy sections may have limited text searchability.

Completeness:

Comprehensive parts identification. Notably lacks part numbers as per product description, which is a significant limitation for direct ordering but excellent for visual reference.

⚙️ Engine Specifications

Engine Type:

2-stroke, single-cylinder

Engine Displacement:

49.3 cc

Engine Cooling:

Liquid-cooled

Bore X Stroke:

Approximately 39.5 mm x 40.3 mm (typical for AM6 engine)

Horsepower Rating:

Typically around 8-10 HP at the crankshaft (varies by region and tuning)

Torque Rating:

Not prominently specified, but sufficient for its class to achieve spirited acceleration.

Fuel Delivery:

Carburetor (e.g., Dell'Orto PHBN 14/16)

Fuel Type:

Unleaded gasoline (95 RON recommended), mixed with 2-stroke oil

Ignition System:

Electronic CDI

🔧 Transmission

Transmission Type:

6-speed manual

Clutch Type:

Wet, multi-plate

Final Drive:

Chain drive

Gear Ratios:

Specific gear ratios are not provided but are optimized for spirited performance in a 50cc class.

Transmission Fluid:

Gear oil, typically SAE 75W/90 or SAE 10W/30 (refer to specific service manual for exact type and capacity).

📐 Dimensions

Length:

Approx. 1950 mm (varies slightly)

Width:

Approx. 700 mm (at handlebars)

Height:

Approx. 1100 mm (at handlebars)

Wheelbase:

Approx. 1330 mm

Dry Weight:

Approx. 105-110 kg (varies by equipment)

Gross Vehicle Weight Rating:

Not specified, but typically around 250-275 kg including rider and cargo.

Fuel Tank Capacity:

Approx. 13 liters

Seat Height:

Approx. 820 mm

🛡️ Safety Features

Safety Ratings:

As a 50cc motorcycle, specific crash test ratings from agencies like NHTSA or Euro NCAP are generally not applicable or provided in the same manner as for cars. Safety is derived from design, braking, and handling capabilities.

Active Features:

Disc brakes front and rear, responsive suspension, balanced chassis geometry.

Passive Features:

Frame construction, rider ergonomics designed for control, lighting system (headlight, taillight, turn signals).

💡 Technology Features

Infotainment System:

Basic dashboard with analog speedometer and tachometer, or a digital display on some higher trims. Primarily focused on essential riding information.

Driver Assistance:

No advanced driver assistance systems typical of modern automobiles. Safety relies on rider skill and the vehicle's handling characteristics.

Connectivity:

No onboard connectivity features like Bluetooth or GPS.

🔧 Maintenance

Service Intervals:

Specific intervals (e.g., oil changes, spark plug checks) are not detailed in the product description but would typically include regular checks for a 2-stroke: spark plug cleaning/replacement every few thousand km, gearbox oil change annually or per manufacturer recommendation, air filter cleaning/replacement as needed, and piston/ring inspection at higher mileages or if performance drops.

2 Stroke Oil:

High-quality 2-stroke synthetic or semi-synthetic oil, mixed with fuel (autolube system) or directly in the fuel tank (if pre-mix specific).

Coolant:

Ethylene glycol-based antifreeze/coolant mixture (typically 50/50 with distilled water).

Brake Fluid:

DOT 4 or DOT 5.1 (refer to service manual for specific type).

Known Issues:

Common issues for 50cc 2-strokes can include carburetor tuning sensitivity, piston and cylinder wear over time, clutch wear, and electrical connections susceptible to corrosion. The AM6 engine is generally robust but requires diligent maintenance.

Preventative Maintenance:

Regular cleaning of the air filter, checking and adjusting chain tension, ensuring proper 2-stroke oil mixture, and keeping the cooling system maintained are crucial for longevity.

📚 Vehicle History

Brand Heritage:

Derbi is a Spanish manufacturer with a long history in motorcycle production, particularly in smaller displacement and performance-oriented models. They are known for their competitive spirit in racing, especially in lower cubic capacity classes.

Model Evolution:

The GPR 50 Racing is part of Derbi's lineage of stylish 50cc sportbikes, building upon previous iterations of the GPR model. It aimed to provide a premium, 'big bike' feel in the 50cc segment, and this generation reflected contemporary sportbike design trends.

Production Period:

Models 2004-2005 represent a specific update or iteration within the GPR 50 Racing's production run.

Manufacturing Location:

Spain (Derbi's primary manufacturing base)

🏆 Awards & Recognition

Recognitions:

While specific awards for the 2004-2005 GPR 50 Racing are not readily documented, Derbi has a history of success in youth racing categories and has been recognized for its sportbike designs in the 50cc class.

User Ratings:

Generally well-regarded by enthusiasts for its styling, handling, and performance relative to its displacement class.