i just dont see it..i mean the 2 strokes parts are cheaper, easyer to work on,lighter & more powerful. the 4 stroke is beat in every way it takes twice the mount of CC's to even be able to keep up & just way to much money i just dont get it..its starting to make me sick watching supercross listning to the anouncers talking about how much horse power the 450F's have dee"dee"dee" 200CC's more. aaahhhh