Yay! After a couple of minutes with a spanner on the engine mounts the problem appears to be solved. DL tweaked the rear mounts near the shock linkages with a torque wrench.
No more knocking sounds, anwhere in the rev range. Thanks DL! I'm tellng myself they only came loose because of my rigorous linkage maintenance...
I think the tank has to drained, rinsed thoroughly (and then aired), stripped of paint and then silver soldered - carefully! Not a DIY option, I don't think!
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