Ducati SS, no oil cooler so does that make it a 600? 1994 750SS Nuda. https://de.wikipedia.org/wiki/Ducati_750SS#/media/File:Ducati_750_SS.JPG
California 1100 EV Special Sport
California 1100 EV, at least that's how the magazine website reviews have it.
Early Suzuki GSX-R 750-1100 Slabby.
Yamaha XVZ 1300 Royal Star? Going by the primary drive casing I think this one is a Harley-Davidson. Maybe a Softail Heritage Classic? Looks like the bottom pic here - Link to "www.motorcyclespecs.co.za"
Now that was a surprise! Thanks a lot!