Lots of ktm 144 here in europe and no problems with them. And they are not only fast enough but 99% for sure you will be faster on a 144 then on a 25o 2 stroke or 450 four stroke. Because even prof?expert riders do not manage to be faster on a 450 then on a 250 four stroke. So a 144 is about the same speed as a 250 4 stroke. So if you want to be fast buy the 144. And you are not too heavy.