A misfiring engine or loss of spark could simply be a bad spark plug. Replace it quickly and easily with genuine NGK MR7F spark plug. Replaces Polaris part number 3022639 and 3022662. Sold EACH. Fits the following Polaris models: 2015-18 RZR 570 2014-19 RZR 900 (All) 2014-18 RZR 1000 (All) 2018 RS1 2015-16 ACE 325 2015-18 ACE570 2016-18 ACE 900 2016-19 General 1000 (All) 2015-19 Ranger 570 (All) 2015-18 Ranger 900 XP (All) 2017-19 Ranger 1000 XP (All) 2015-16 Ranger ETX 2015-18 Sportsman 570 (All) 2015 Sportsman ETX