Italian engine....and 4 wheels, so a quad rather than a bike.

https://www.youtube.com/watch?v=gGmWm1i6pVo

Completely ridiculous, but the engineering looks stunning.

don't go round any fast hairpins!

I wondered about that. It does have independent axles though so it should go around corners to some degree.

Yes I guess he doesn't look too confident/happy on a few corners on the vid, I wonder what the gyroscopic effect is like with two wheels in such proximity and the torque/power that engine must have.....frightening. Looks almost futuristic super hero-esque though

Looks great. That's a 4.7 L V8 Maserati engine in case you're wondering !