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The fourtrax will top out at about 55MPH.    Actually a stock fourtrax 250x runs at a top speed of 62, but with slight mods can increase the speeds to well over 75. Answer   it depends what has been done to it but a normal cr125r would go 60 to70 mph they cant go too fast because a cr450 goes 80mph to 100mph.
No production car in the world could do 4x the speed limit on motorways in the most of the world where limits exist. Look at this map. Officially the worlds fastest production car is the Veyron Super Sport @ 258mp/h (415km/h), though the Hennessey Venom can apparently do 270mp/h (434 km/h).