I know what engine and drive train I would fit.
ENGINE
Type
90° V-twin engine, 4-stroke, 4 valves, double ignition
Cooling
air and oil with an independent cooling pump. Oil radiator with thermostat controlled fan.
Engine capacity
1380 cm³
Bore and stroke
104 x 81.2 mm
Compression ratio
10.5 : 1
Maximum power
71 kW (96 HP) at 6500 rpm
Maximum torque
87 ft-lb - 120 Nm @2750 rpm
Fuel supply / Ignition
phased electronic Multipoint sequential injection, Magneti Marelli IAW7SM; “ride by wire” Ø 52 mm throttle body, IWP 243 Magneti Marelli injectors, double oxygen sensor, integrated management of 3 engine mappings, traction control, cruise control
Starter
Electric
TRANSMISSION
Gearbox
6 speeds with final overdrive
Final drive
double cardan joint and fixed bevel gear seat
Clutch
single-disc with integrated anti-vibration buffer