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Need help, bought a used 2012 Summit 600 HO with 500 miles, took for a couple short rides 3-4 miles and ran fine. Then took out and noticed a vibration/noise when applying throttle, gets worse the faster the track spins. Almost feels like track is slipping, checked tension and alignment, lifted track and does the same with no load on it. Looked for any contact it could be making and couldn't find anything. Help please...