I'm looking at a 2008 RMK 600 for my wife. The guy is a little high on price and the sled has 4000 miles. Anything I should be careful of or be reluctant to purchase because of? I have recently come from the cat side of the mountain and don't know much yet about polaris besides stay away from 800's! would 4000 miles require a new top end? Any help or insight would be great!!!!