Certainly the biggest update to the 570 is its Pro Star 570 engine. The 567cc four-stroke mill features a high performance, four-valve, double-overhead-cam design. If it sounds familiar, that's because it's based off the engine powering the Polaris RZR 570. Polaris says the Sportsman 570 churns out 22% more horsepower then the old Sportsman 500.
