Didja get a look at the exposed valve gear?
Valve stems, valve springs, and rockers all exposed to the open atmosphere.
No covers.
Some old bikes of that era didn't even have valve oilers. You stopped periodically, and got out your oil can, and squirted some oil on the valves and rockers!
I guess maybe wiped the road grunge off them too.
Yikes!
Beeeauuutiful bikes, though!
I would LOVE to have one!
One of the nicest bikes of all time, IMO.