It depends on what state you live in as to what you have to do to obtain a registration for your sled.Just go to your DMV with a VIN (vehicle ID number) and ask them what you have to do to get it legal.
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past to present:
71 AC Lynx, 2000 340 Deluxe, 2001 Edge X 600, 2002 Pro X 440 fan, 2003 Pro X 600, 2006 MXZ 550X and now a 2004 Pro XR 800