These are the known mechanical and performance specifications for your 2009 Derbi Dirt Boy 50.
Basic Specs
Engine
Displacement49.90 ccm (3.04 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression12.0:1
Bore/Stroke39.0 x 41.8 mm (1.5 x 1.6 inches)
Valves/Cylinder
FuelingCarburettor. 14 mm
IgnitionCDI
Exhaust
LubricationOil pump
CoolingAir
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity2.30 litres (0.61 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front SuspensionHydraulic fork.
Front Travel120 mm (4.7 inches)
Rear SuspensionMonoshock.
Rear Travel140 mm (5.5 inches)
Seat
Seat Height610 mm (24.0 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height
Total Length1,290 mm (50.8 inches)
Total Width519 mm (20.4 inches)
Ground Clearance
Wheelbase905 mm (35.6 inches)
Dry Weight47.0 kg (103.6 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre2.50-12
Rear Tire/Tyre2.75-10
Front BrakesSingle disc
Front Brake Diameter160 mm (6.3 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter90 mm (3.5 inches)
Wheels
Comments
Spanish made bike. Intended for child use.