i was told that kx500 was the fastest dirt bike made. Followed by the cr500. I haven't looked into the ktm 550. How is that? Around my house there are long trails. Long dirt roads, so i do not think a 2 stroke would be a choice for me. But i was wondering what 4 stroke could keep up with those 2 strokes? Because i know all three of them would eat 4 strokes. OR should i go with something like a cr250 or cr450 4 stroke? i was just wondering what you guys think. Any impute would be much appreicated. Thank you.