I know this doesnt really go along with the whole topic at hand but I just do not understand the whole hype with 4 strokes all of a sudden, I mean several years ago if you brought a 4-stroke to the track you'd probably get laughed off. Now I have been out of the moto scene for awhile and am just now getting back in it but, of the few tracks I have been to recently everyone is running 4 strokes. I understand that 4 strokes are more economical as far as pollution but to me its not the same. Mfgs still produce 2 strokes so why the drastic change in people buying them?