Yes it is true that in 2006 2 strokes will not be able to ride trails and everything. They will only be able to ride closed circuits meaning tracks, and not all tracks either, but if you were to by a 2002 2 stroke you will be able to ride it wherever 4 strokes can for as long as you want. The new rules in 2006 don't apply too anything that is made before 2006. So if you had a 2005 CR250 you could ride it on trails with the 2008 4 strokes and it would be legal as long as where you are riding is a legal off-road area that is.