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Derbi Dirt Boy 50 - 2009 Specifications and Reviews

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.

2009
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Engine and Transmission Specifications

Gearbox1-speed
Cooling systemAir
Lubrication systemOil pump
StarterKick
IgnitionCDI
Fuel systemCarburettor. 14 mm
Bore x stroke39.0 x 41.8 mm (1.5 x 1.6 inches)
Compression12.0:1
Stroke4
Engine typeSingle cylinder
Capacity:49.90 ccm (3.04 cubic inches)
 
 

Physical measures and capacities

Wheelbase905 mm (35.6 inches)
Overall width519 mm (20.4 inches)
Overall length1,290 mm (50.8 inches)
Seat height610 mm (24.0 inches) If adjustable, lowest setting.
Dry weight47.0 kg (103.6 pounds)

Derbi Dirt Boy 50 dimensions and frame

Rear brakes diameter90 mm (3.5 inches)
Rear brakesExpanding brake (drum brake)
Front brakes diameter160 mm (6.3 inches)
Front brakesSingle disc
Rear tyre dimensions2.75-10
Front tyre dimensions2.50-12
Rear suspension travel140 mm (5.5 inches)
Rear suspensionMonoshock.
Front suspension travel120 mm (4.7 inches)
Front suspensionHydraulic fork.

Speed and acceleration

Color optionsBlack/white
Oil capacity0.60 litres (0.04 quarts)
Fuel capacity2.30 litres (0.61 gallons)
 
 

CategoryMinibike, cross
Year2009
ModelDerbi Dirt Boy 50

Rider Reviews

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