-=HONDA 4 cilinder,150 HP +reductor...It will be interesting to see if this UL-39 works out. I've done some work on a similar project I wanted to do. I like motorcycle engines as well, but the clutch and transmission is built in, so I wonder how they will deal with that. There's a BMW twin that comes apart from the transmission, but it doesn't have as much power as the latest superbike engines.
Development of an Ultralight with a Ducted Fan - pdf.io