Didn't get much done today but started plastigauging bearings before I timed out. I think this crank has been ground at some point. Rod bearing journals measure evenly right across at 39.965 mm which is one thou below a C. I would expect if this was wear that the area between the rods would be larger than where the bearings run. The surface looks good.
A 'B' journal with a '2' rod should be a green bearing but this gives a 0050 thou oil clearance which is over spec. Next I will try brown bearings which at a guess will be coming into oil clearance spec .... if not I have black.
The rings were gummed into their grooves. This is why the bike woken up from long hibernation generally initially has low compression. This often sorts itself out once the motor has done a couple of hundred miles. This one's getting new rings.