Is it true? Dual overhead cam? Throttle body and port injected? Hydraulic clutch? Beauty eh? Looks like it might be the Montesa engine judging from the 10 tooth countershaft sprocket, but that engine isn't branded "Honda".
What's the displaement? 449?
Definately looks like a SOHC.
Why so big on the clutch cover? Would have to see it in a 450R frame to warm up to it. Kinda a huge departure from the norm in a way...