A misfiring engine or loss of spark could simply be a bad spark plug. Replace it quickly and easily with this spark plug you would find at the dealer but not paying the extra cost. Replaces Polaris part number 3021671. Please check with Polaris parts diagrams to ensure proper fitment. Sold EACH. Two spark plugs are required for twin cylinder engines. Fits the following models: 2003-05 Sportsman 600 2002-07 Sportsman 700 2005-14 Sportsman 800 2007-09 Ranger 700 2010-14 Ranger 800 2009-14 RZR 800 2009-14 RZR S 800 2010-14 RZR 4 800