I'm amused by the fact that my "little" 2016 Sector 250 tops out at about 43mph with my 250 lb butt driving it and is quicker than my brother-in-law's new Axis 550 (with 200 lbs driver); which tops out at about 37mph. I easily win the "run and get the mail" and "take out the garbage" races; but the 550 4x4 is a beast in the woods and off trail (which is why it gets to go to deer camp, and the 250 stays at home).
My Sector 250 isn't stock, btw. I replaced the ECU with an older, higher revving ECU that HiSun USA pulled out of all the "too fast" first year 2015 models and changed the rear sprocket (2 teeth smaller... 42 to 40 I think, if I remember correctly).