STIHL Spark Plug Reference GuideHandheld Blowers BG 45, 46, 55, 65, 85 BG 56, 66, 86 Backpack Blowers BR 45, 320, 320 L, 340, 340 L, 350, 400, 420, 430 BR 200, 500, 550, 600 Edgers FC 44 FC 55, 75, 85 FC 56, 70 FC 83 FC 90, 95, 100, 110...