We have had (to the best of my knowledge) one instance of this before...

http://www.xt660.com/showthread.php?t=22711

Yamaha will replace it like-for-like under warranty.

As I said in your other thread, I really don't think fitting HD plates or springs will be necessary; they'll just make the clutch action heavier, more juddery and harder to feather/control. For the clutch to have gone in such a short distance their will almost certainly have been either a fault in one of the components, or it was set up incorrectly/miss-adjusted from the off. Even fairly well abused XTs easily see north of 50K miles on a stock clutch if they are properly adjusted and the correct oil is used.

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