As thin as an ATV rotor is, you would be better off just replacing it, theres just not enough metel there to try and resurface.
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2011 Sportsman XP 550 EPS
Front And Rear Rack Extensions, Rear Lock And Ride Box With Back Rest, Heated Hand Grips, winch, Fender Extensions, Front And Rear Bumpers, HID Lights, A-Arm Guards, Low Lock And Ride Windshield, Maxxis BigHorn 2.0 Tires.