The clutch basket is pretty common, but in this case, i don't think that's it. He said it happened suddenly while he was riding. Unfortunately, he didn't say what the noise actually sounded like.
If the cam chain slips, the engine wont usually run at all. The spring cam tensioner actually works pretty good. There is a slider inside there that pushes against the chain. That could fail, but honestly, I've never heard of anyone claiming that it did. Since he's got it all apart, it wouldn't hurt to examine the chain and associated parts.
Hopefully he will post with more data soon.
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