Polaris 12-19 Sportsman 570 Big Bore 625cc (105mm) CompleteUpgraded Top End Rebuild Kit. Includes a forged Wossner piston, 105mm big bore (nickel plated) cylinder, and all the top end gaskets needed to build your 570 into a beast Polaris Sportsman 570 Big Bore Kit Polaris 2014-2013 Sportsman 570 Big Bore 625cc Upgraded Top End Fahrwerk Komplett Type: Top End Rebuild Kit, Warranty: 1 year warranty Neu, Brand: Polaris