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Hi guys
I'm just stripping an 850 mk3 motor for rebuild. I have found it is fitted with these pistons. They are 79mm and forged. There are no markings at all.
They look good enough to refit, but I will check weights and clearances first.
The bike has been repatriated from the USA so maybe one of our American cousins may have an idea.
Cheers
Paul N
Haven't a clue who manufactured them other than they look very high compression.