That kind of stuff is always good to know
I'll ask Dave Silvers in the morning, I'm just being impatient. I don't like being without a bike as I don't drive a car. The idea was to run the XBR until my XL600 was roadworthy then strip it down and completely rebuild, but money's dried up somewhat so the project's floundering a bit.
I got sick of the popping and farting and clattering from the XBR so I thought I'd better address the problem before I did some terminal damage. The top end looks surprisingly healthy so far. Cams and followers etc are in really good nick. The cam chain is definitely on it's last legs though.
Cheers,
Dave B