Interesting when stuff like that turns up.
The 650 Yamaha is really ugly. They made ugly bikes then, and still do. If the engine is good, throw the rest away.
The sporty is somewhat better. The bars are weird, never saw that before. I remember the springer, but not who made them. It could look good again, using the frame and engine as a start. Ditch the springer and screwy little wheel, get a modern fork on it with real brakes. Then add sprung solo and tank to suit, with tasty bars instead of no taste bars. Then it's headed back to something OK.