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I would definately check the chain case. My wife's sled was making that kind of rough sound and the chain was super loose. I tightened it up and no more noise, also my suspension was missing a bolt so the track was loose. I replaced the bolt's and tightened up the track and I have not had a problem yet.
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1995 polaris 670 Rotax mod (mine) 
1985 polaris indy 400 (wifes) 
1982 skidoo 3500 citation (kids) 
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