Derbi boulevard 125 4t Workshop Manual page 9

Characteristics
Engine
ENGINE
Specification Desc./Quantity
Engine Single-cylinder, 4-stroke Piaggio LEADER
Timing system Single overhead camshaft (SOHC) with 2 valves
Valve clearance intake 0.10
outlet 0.15
Bore x stroke (125) 57 x 48.6 mm
Bore x stroke 62,6 x 48.6 mm
Cubic capacity (125) 124 cm³
Cubic capacity 150,46 cm³
Compression ratio (125) 10.6 : 1
Compression ratio 10.5: 1
Carburettor KEIHIN CVEK26
Engine idle speed approx. 1600 ÷ 1800 rpm
Start-up Electric
Maximum power to crankshaft (125) 10.5 CV at 8000 rpm
Max. power 11.6 hp at 7750 rpm
Cooling Forced air circulation.
CHAR - 9