Ain't it just - fabulous attention to detail and fine looking stance. Haven't got a clue what motor is in it mind although it does appear to have a reverse head.
All I can see is it’s a diesel, possibly from a small diesel powered piece of construction equipment made by Kubota.
The owner, an X race engine builder, re-engineered the whole bike to suit, and also fabricated every modification that was needed, a real credit to the man. if that wasn't enough, he looked at power and efficiency modifications to the engine as it was his trade, and achieved an improvement of around 10 to 15%.
It's a very well executed piece of engineering, a real labour of love. I part with real money for something so well engineered. Did you hear in run, probably sounded less like a cement mixer than most Ducati's.