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Recently picked up a 2010 600 dragon switchback with 2500 miles. Took it out finally the other day and noticed it wont rev past 7000 and will only go about 70 mph. Also noticed that if you get going and hold it wide open it will just die out then rev up and keep doing that for awhile and eventually clears out. Its fine if you ease into the throttle. Exhaust valves have been cleaned and seemed to operate fine, tried a new belt but disnt help, when the new belt was on it made the clutches kind squeek until they engaged. Any ideas?