Cubic capacity 399 cm³
Bore x stroke 85.8 X 69 mm
Compression ratio 10.6 ± 0.5 : 1
Idle speed 1500 ± 100 rpm
Maximum torque (to the
crankshaft)
37.6 Nm at 5500 rpm
Maximum power (at the
crankshaft)
25 kW at 7500 rpm
Electronic ignition inductive, high efficiency
integrated with the injection
system, with variable timing and
separate HV coil.
Ignition advance (before TDC) Variable advance controlled by the
injection control unit
Fuel supply 38 Ø mm throttle body and single
injector
Lubrication Engine lubrication with trochoidal
pump (inside the crankcase), oil
filter and pressure adjustment by-
pass.
Cooling Forced fluid circulation, with
engine driven pump; 3-way
thermostat to pump intake.
Transmission Automatic expandable pulley
speed variator, V belt, dry self-
ventilating automatic centrifugal
clutch, gear reduction unit and
transmission casing with forced air
circulation cooling.
Spark plug
•
NGK CR7EKB
71
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