I know this was awhile ago but I think I read on grizzly central that there is a fix and Yamaha was picking up the tab, think its a regulator issue. Might wanna search it out. Almost positive.
Thanks Bigbore. I think I saw the same discussion and asked my dealer about it. They said that there was no way this would be covered by any kind of special warranty, so I had to buy a new one which was around 500 bones. In fact, I think I even called Yamaha directly.
If I ever hear that Yamaha does take responsibility for it, I'll have them repair my old one and put it up on e-bay. At very least, the quad now has 2200km less on the odometer.