Bordone-Ferrari Rally bike

interesting.... what engine powers this baby?

https://www.motorcyclespecs.co.za/model/Custom%20Bikes/Bordone-Ferrari%20Moto%20Italiana%20Mi1.htm



Make: Bordone-Ferrari Italian Motorcycles
Model: Mi1 Rally
Engine: 4-stroke TM single cylinder
Displacement: 449 cc
Bore and stroke: 97 mm x 60.8 mm x 1
Power: na
Induction: Keihin carburettor 41 cm
Ignition: Keihin Digital electronic
Starter: Electric
Clutch: Wet multi-disc oil bath
Transmission: 5-speed, Chain
Chassis Type: Tubular trellis / chromium molybdenum steel
Swingarm: Aluminum two sided
Front Suspension: Kayaba inverted fork 48 cm
Rear suspension: Progressive, Donerre shock, 305 mm travel!
Front brake: Brembo 2-piston 300 mm
Rear brake Brembo 1-piston 240 mm
Wheels / tires: 90/90-21″and 130/80-18″
Dry weight: 130 kg
Kerb Weight: 158 kg
Overall length: 221 cm
Wheelbase: 1,535 mm
Seat height: 996 mm
Fuel tank capacity: 32 liters