Gen 1 - slight clonk from rear.

[JayB]

OK, I re-checked last night and the chain does have a couple of tighter sections and I think I had it a little overtight. Also properly loosened the caliper bolt and tightened it back up last.
Haven't had a chance to ride it yet, but I am thinking of putting on a new C&S kit and some nice premium rubber as I have a bit of cash coming my way shortly, so might get the expensive bits out the way while I can.