polaris 850 jumps when RPM goes higher than idle

I have this 2009 Polaris 850 which I had just purchased used, and the idle RPM is 1200. When I put it into gear nothing happens until I give it a little gas and bring the RPM to approximately 1600 – 1700 RPM; at this RPM it feels as if kicks into gear and kind of jumps and gets going very powerfully. Is this normal? Is the idle RPM supposed to be 1200? Can anyone tell me why this ATV gets into gear only at a higher RPM? Is this normal? Is there a solution to this issue? Is it supposed to jump?
Jim O.