My s1k is now up to approximately 17000 km's after being purchased at 6500 and a few days ago when I was on a ride with some mates the clutch started to slip. Got a mate who knows more then I to have a look and there was no free play so we adjusted it up and kept going. Little bit further down the road it started slipping again so we had another look and no free play. We adjusted it up again and I limped it home with it slipping reguarly.
I've since found out that the inside clutch fibre shattered and fell into the sump when the slipped activated. Also it took chunks out of the inner basket when it went... upon inspection the torn up basket appeared somewhat porous making me think of a possible miscast.
This happened within a week of having 2 headlight bulbs explode and take chunks out of the reflector... had that fixed under warranty. The experience has somewhat shaken my faith in BMW. My dealer has been taking care of me but I shudder to think of how much the clutch repairs are going to cost if warranty won't cover it... maybe I should have got a 1098... woulda been cheaper