2009 Arctic Cat 550 H1 EFI, READY TO RIDE!!! - GIVE THE TRAIL SOMETHING TO REMEMBER YOU BY. Got a passion for adventure? This bad boy has you covered. At its core is a liquid-cooled four-stroke H1 EFI engine, plus a fully independent suspension and an industry-leading 11 inches of ground clearance so you can power over the roughest terrain without a second thought, or even a first.