I have no idea what the "stock" ones weigh but I think they are about the same as the konis I had on. Maybe a tad bit lighter...nothing real noticeable.
I have this kit and it says D2 on the package. There are minor differences between the D2's and the KSports. My KSports seem to ride VERY stiff...almost unbearable to drive with. I am going try them on full soft and see what happens. They may be forsale soon.....