I just finished reading the entire thread. Now I'm feeling a bit uneasy. I just bought a 1996 900SS/CR with 17k miles on it three weeks ago (haven't ridden it yet, carbs are being refurbished). After learning of cracked frames at the headstock, and now cracked/broken engine mounts on the cases ... I can't help but think "what have I got myself in to here?"
I bought a Ducati thinking it was a world class motorcycle. Now I'm frettin' over cracked frames, cracked engine cases, broken head bolts (yes, I have the chrome colored ones .. BUT I have a full set of the stock black ones on hand) ... lions and tigers and bears OH MY!
It's no one's fault but my own. I should have done more research on the brand/model/year before I turned loose of $4k.