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I have a friend who owns a 2000 Big Bear 400 4x4 and we clocked it at approximately 47-48 mph that is according to the speedometer on my Honda Rancher.
I have a 2002 Big Bear 4x4 with a speedometer, it revs up pretty high at around 40mph, but i have had it to 50mph, yes i think that it will break 50mph.