Just returned from short trip out of the city being towed by a car...on rope
Clutch gave up all of the sudden, the lever got stiff immediately and
adjusting didn't helped much. I could slowly ride for few km but any hill was out of the question. I am really disappointed because the bike is new, 1500km (900 miles) on the clock,
just back from the first maintenance service and clutch is gone when I didn't even start to ride seriously offroad what kinda plates yamaha puts in, from paper?

What do you think, stock clutch is really that bad or I had bad luck?
I understand repair will be under warranty but should I put better clutch
maybe right away since I'm planning dirt, sand riding?

p.s.
BTW being towed by a car on rope connected on both sides with hooks
is something I don't want to repeat anymore. I do not recommend this, by the book you should have loose end on your side ready to drop anytime.

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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so basically you are saying I had bad luck plus it proves the lack of QA in factory in France. Thanks for link, I am not only one then.
I hope yamaha will replace it under warranty.