| TECHNICAL SPECIFICATION |
|---|
| Model ID |
|---|
| Manufacturer (Make) | Derbi |
| Model Name | Dirt Boy 50 |
| Year | 2009 |
| Category(class) | Pocket bike / Minibike (Cross) |
| Engine |
|---|
| Engine Capacity (Displacement) | 49 ccm (2.99 cubic inches) |
| Engine Type | Single cylinder, four-stroke |
| Bore x Stroke | Ø39.0 mm x 41.8 mm (Ø1.54 inches x 1.65 inches) |
| Bore/Stroke Ratio | 0.93 |
| Compression Ratio | 12.0:1 |
| Fuel System(Carburetion) | Carburettor. 14 mm |
| Ignition | CDI |
| Starter System | Kick |
| Lubrication System | Oil pump |
| Cooling System | Air |
| Powertrain |
|---|
| Gearbox | 1 speed |
| Chassis/Suspension/Brakes |
|---|
| Front Suspension | Hydraulic fork. |
| Front Suspension Travel | 120 mm (4.72 inches) |
| Rear Suspension | Monoshock. |
| Rear Suspension Travel | 140 mm (5.51 inches) |
| Front Brakes | Single disc |
| Front Brakes Diameter | Ø160 mm (Ø6.3 inches) |
| Rear Brakes | Expanding brake (drum brake) |
| Rear Brakes Diameter | Ø90 mm (Ø3.54 inches) |
| Front Tire | 250-12 |
| Rear Tire | 275-10 |
| Dimensions |
|---|
| Overall Length | 1290 mm (50.79 inches) |
| Overall Width | 519 mm (20.43 inches) |
| Seat Height | 610 mm (24.02 inches) |
| Wheelbase | 905 mm (35.63 inches) |
| Dry Weight | 47.0 kg (104 lb) |
| Fuel Capacity | 2.30 litres (0.61 gallons) |
| Performance |
|---|
| Top Speed | - |
| Acceleration (dart, speedup) time | |
| 0-100 km/h | - |
| 0-60 mph | - |
| 1/4 mile | - |
| 60 to 140 km/h, highest gear | - |
