Derbi Dirt Boy 50
2009Minibike

Derbi Dirt Boy 50

Key specifications

Engine
50 cc
Weight
47 kg
Fuel type
petrol
Fuel capacity
0.6 L
Transmission
1-speed
Seat height
24 mm
Front brakes
Single disc
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 2009 Derbi Dirt Boy 50, a spirited minibike-cross designed specifically for young riders eager to conquer the dirt tracks with confidence and flair. Known for its lightweight construction and nimble handling, the Dirt Boy 50 is ideal for beginners looking to make their mark in the world of off-road motorcycling. Its compact dimensions and manageable seat height make it approachable for younger riders, while still delivering a thrilling experience that captures the essence of motocross. At the heart of the Dirt Boy 50 lies a robust 49.90cc single-cylinder, four-stroke engine that strikes a perfect balance between power and efficiency. With a compression ratio of 12.0:1 and a bore and stroke of 39.0 x 41.8 mm, this engine delivers smooth acceleration and reliable performance on a variety of terrains. The air-cooled system and CDI ignition ensure that the engine remains cool under pressure, while the 1-speed gearbox allows for seamless power delivery, letting riders focus on navigating the track without the distraction of shifting gears. Whether zipping through the woods or tackling a dirt track, the Dirt Boy 50 offers a thrilling ride that instills confidence in its young operators. The Dirt Boy 50 comes equipped with a host of features that enhance its performance and usability. The hydraulic front fork and monoshock rear suspension provide impressive travel of 120 mm and 140 mm, respectively, allowing riders to tackle uneven surfaces with ease and comfort. Braking is handled by a responsive single disc brake up front and an expanding drum brake at the rear, giving riders control when they need it most. Weighing in at just 47.0 kg (103.6 pounds), this machine is both lightweight and agile, making it easy for young riders to maneuver. Available in striking black and white color options, the Dirt Boy 50 is as stylish as it is functional, ensuring that kids ride in both safety and style. In summary, the 2009 Derbi Dirt Boy 50 stands out as a fantastic entry-level minibike that combines safety, performance, and fun. It's an excellent choice for young enthusiasts looking to build their skills and enjoy the thrill of off-road riding.

Pros

  • Lightweight and Compact: Weighing only 47 kg, it's easy for young riders to handle, making it perfect for beginners.
  • Smooth Engine Performance: The 49.90cc four-stroke engine delivers reliable power and easy throttle response, ideal for novice riders.
  • User-Friendly Features: With a low seat height of 610 mm and simple kick-start operation, the Dirt Boy 50 is designed for ease of use.

Cons

  • Limited Power for Advanced Riders: As a beginner bike, it may not satisfy more experienced young riders looking for higher performance.
  • Single-speed Gearbox: The lack of gears limits versatility and might restrict advanced riding techniques.
  • Small Fuel Capacity: With only 2.30 liters of fuel storage, riders may find themselves refueling more often during longer rides.

Technical details

Source specification data

Make
Derbi
Model
Dirt Boy 50
Category
Minibike-cross
Starter
Kick
Comments
Spanish
made bike.
Intended
for child use.
Color Options
Black/white
Gearbox
1-speed
Ignition
CDI
Fuel System
Carburettor. 14 mm
Bore X Stroke
39.0 x 41.8 mm (1.5 x 1.6 inches)
Compression
12.0:1
Displacement
49.90 ccm (3.04 cubic inches)
Cooling System
Air
Engine Details
Single cylinder, four-stroke
Lubrication System
Oil Pump
Dry Weight
47.0 kg (103.6 pounds)
Seat Height
610 mm (24.0 inches) If adjustable, lowest setting.
Oil Capacity
0.60 litres (0.04 quarts)
Fuel Capacity
2.30 litres (0.61 gallons)
Overall Width
519 mm (20.4 inches)
Overall Length
1,290 mm (50.8 inches)
Rear Tyre
2.75-10
Front Tyre
2.50-12
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Single disc
Rear Suspension
Monoshock.
Front Suspension
Hydraulic fork.
Rear Wheel Travel
140 mm (5.5 inches)
Front Wheel Travel
120 mm (4.7 inches)
Rear Brakes Diameter
90 mm (3.5 inches)
Front Brakes Diameter
160 mm (6.3 inches)

Available colors

Black/white