What category is the 2009 Derbi Dirt Boy 50?

The 2009 Derbi Dirt Boy 50 has a Category of Minibike, cross.

What is the engine size of the 2009 Derbi Dirt Boy 50?

The 2009 Derbi Dirt Boy 50 has a Capacity: of 49.90 ccm (3.04 cubic inches).

What type of engine does the 2009 Derbi Dirt Boy 50 have?

The 2009 Derbi Dirt Boy 50 has a Engine type of Single cylinder.

Is the 2009 Derbi Dirt Boy 50 air cooled or liquid cooled?

The 2009 Derbi Dirt Boy 50 has a Cooling system of Air.

How many gears does the 2009 Derbi Dirt Boy 50 have?

The 2009 Derbi Dirt Boy 50 has a Gearbox of 1-speed.

How much does the 2009 Derbi Dirt Boy 50 weigh?

The 2009 Derbi Dirt Boy 50 has a Dry weight of 47.0 kg (103.6 pounds).

What is the seat height of the 2009 Derbi Dirt Boy 50?

The 2009 Derbi Dirt Boy 50 has a Seat height of 610 mm (24.0 inches) If adjustable, lowest setting..

Derbi Dirt Boy 50 - 2009 Specifications and Reviews

Name: 2009 Derbi Dirt Boy 50
Brand: Derbi

The 2009 Derbi Dirt Boy 50 is a lightweight minibike designed for young riders and beginners seeking off-road adventure. Its compact 49cc single-cylinder engine and minimal 47kg weight make it highly maneuverable on trails and dirt tracks. Known for its reliability and ease of operation, this entry-level cross bike excels at introducing new riders to motorcycle riding fundamentals.

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2009

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Engine and Transmission Specifications
Gearbox	1-speed
Cooling system	Air
Lubrication system	Oil pump
Starter	Kick
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
Stroke	4
Engine type	Single cylinder
Capacity:	49.90 ccm (3.04 cubic inches)

Physical measures and capacities
Wheelbase	905 mm (35.6 inches)
Overall width	519 mm (20.4 inches)
Overall length	1,290 mm (50.8 inches)
Seat height	610 mm (24.0 inches) If adjustable, lowest setting.
Dry weight	47.0 kg (103.6 pounds)

Derbi Dirt Boy 50 dimensions and frame
Rear brakes diameter	90 mm (3.5 inches)
Rear brakes	Expanding brake (drum brake)
Front brakes diameter	160 mm (6.3 inches)
Front brakes	Single disc
Rear tyre dimensions	2.75-10
Front tyre dimensions	2.50-12
Rear suspension travel	140 mm (5.5 inches)
Rear suspension	Monoshock.
Front suspension travel	120 mm (4.7 inches)
Front suspension	Hydraulic fork.
Speed and acceleration
Color options	Black/white
Oil capacity	0.60 litres (0.04 quarts)
Fuel capacity	2.30 litres (0.61 gallons)

Category	Minibike, cross
Year	2009
Model	Derbi Dirt Boy 50
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track10%

City15%

Cornering30%

Daily Riding10%

Touring5%

Passenger0%

Rider Profile

Best For	This is a machine for young or beginner riders, typically kids learning basic throttle and balance control rather than experienced adults.
Purpose	Built as a small-wheeled minibike for casual backyard or off-road play riding rather than any competitive or commuting use.
Rider Fit	Its tiny 610 mm seat height and 47 kg dry weight make it accessible to small or lightweight riders, but adults will find it cramped and underpowered.
Character	A simple, single-speed automatic-feel minibike with a low-revving 50cc engine, offering easygoing, low-stakes fun rather than performance thrills.
Not Ideal For	Not suitable for highway travel, touring, carrying passengers, or any rider seeking real speed or long-distance comfort.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.