2007 Sportsman 800 EFI - Clattering Noise

I have an 07 Sportsmand 800 that I just purchased about a month ago.  It was a carry over from last year and felt like I got a pretty good deal on it.  I have one question though:  It seems to really clatter like there is a problem with a U-Joint or something in the drive train.  I called the service department at the dealer that I bought it from and they tell me that the clattering noies is normal.  Does anyone else have this noise going on with thier Sportsman?  Any replies are appreciated.  Thanks.  

I did the same thing 2 years ago with an 05' model I got half way thru 06'.
Does it mostly do it when you let off the gas? Does it sound like it is downshifting somewhat? Or does it do it at idle and when you rev it up out of gear?  

I have an 08 sportsman 800 and it does the same thing. Not sure what it is yet.  My dealer says it's normal.  Although I am having the Polaris rep. take a look at it to see if it is a factory flaw. Sounds like it is the same problem as your.  

I added Lucus oil from Wal Mart to my transmission and it has all but stopped the noise problem...  

just curiousity..the thickening of the fluid maybe eliminated lash to clutch????  

Lash to the clutch?  It still shifts fine and I haven't had any problem for about 200 miles. Is there something I should know by putting thicker oil in the transmission?  

to all with this problem, it is the ebs (electronic braking system) engaging when you let of the throttle, its a normal sound on these machines, have no worries. i ride a 07 sprotsman 800 and my wife rides a 06 sportsman 500. both make this noise but no worries ur not gonna be left on the trail. we rode a 490 mile trip in canada last fall and had no problems just herd the noise the whole trip.
ride hard and ride safe.  

I have a 2009 Sportsman 500Ho that has the same problem...Dealer had it for 4 days and said normal noises for a Polaris..sounded like a CV shaft noise comming from the transmission on the left side, only when i was turning....dealers called it backlash....i call it up chits crick it the trans or shafts fall apart...its only 8 hours old and did'nt do it when i bought it 2 months ago...so its on their arses if it blows....MUDDIE1  

Well my 500 Ho Does'nt have EBS...so its not normal its a defect in the Rear Diff..i been fighting this crap for month now and them lazy arses at Polaris..are'nt even contacting me...if i lose the fight...the ATV will be at their door..!!!