Just a quick post which may save somebody some pain. My mate was working on his GSXR100K2 and found that one of the bolts that holds the rear seat frame to the main frame was pretty loose. When I was mucking about with my bike last night (GSXR1000K1) I found that both bolts that hold the seat frame onto the main frame on the left side, ie under the seat where your left arse cheek sits, were loose, the top one was just about holding on its last thread. I happened to be in our local dealer this morning and was chatting with the mechanic and mentioned this and he said he's had a few like that and has seen one where two bolts were actually missing. So I've just posted this to say check these bolts out next time your near your bike, its probably fine but you never know.