Uh, uh. Even my KTM 125 will easily hit 75 geared appropriately. My CR500, 110.
Unless your CR500 is older than 86, it’s illegal to drive it on the highway (as in, can’t get registration or plates illegal), and your KTM 125 would have to be a four stroke to be street legal. The poster was talking about two strokes like his old Bultaco.
Unless you are seriously suggesting that a thousand almost-thirty-year-old dirtbikes are assaulting Saint Louis roads, I think we can scratch those off the list.