Sorry John, forgot an important 0, one that comes right after the dot
So it should read .0015" - .002"
I measured it with feeler gauges.
.0025" didn't pass so the measurement seems correct to me. (measured it at various heights, and all where the same)
The rub marks you see are more of carbon traces in reality I think (picture's not so good quality). The PO mostly made short runs on it, and there's a lot of carbon deposit in the head and on the piston surface.
The carb hasn't got a choke, but according to the PO it always started well from cold so I think carburettor settings are a bit rich to.
I have taken the pistons off today, and got them on the bench for cleaning. I am going to clean them gently to see if the edges are scored. There where no markings inside the barrels.
I'll try to post a better picture soon for judgement
Thanks