The link for the original thread doesn't seem to be working, so I will post this....
Sander, I'm pretty sure you don't have a Desmo there. It's a Ducati Monza or Sebring model from the late 60's, early 70's. Those are what we call "Spring Motors" ie: the valves have springs, like most 4 strokes. The Desmo singles are much rarer (and more valuable). I have several 250 and 350 Ducati singles, and can give you more info if you need it.
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'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
The Blue Bomber's Website