It was in a 600 triple, not sure what brand it is. It doesn't have a yamaha part number.
Looking at the N I was thinking namura but it doesn't look like the namura N
Looking at the N I was thinking namura but it doesn't look like the namura N
dont know the brand but its a cheaper cast piston, they sell all kinds on ebay. Stock pistons were also cast but made with a "ART" name in it.
Thanks mrviper