Just bought a new 570 Ranger. It has plenty of power, all is good, but how can I get a little more speed out of it? It shuts down at about 52 mph. If it would run about 56-57 I'd be happiER. I thought I would be able to take out the spacer in the clutch but that made no difference at all. Any other ideas? What makes the RZR 570 faster than the Ranger? Is it geared different?