yeah, they make 1, its a KX500AF (http://servicehonda.com/kx500af.html)........ the only better part is that its a 500, not a 450, but then again for a 2009 KX500AF its goin cost ya over 11K and only push about 10HP more at the tire.... trust me, im a 2stroke fan just like u, but the day i sold my cr and got my crf was the best thing i could have done to make myself faster. its about traction and being able to make all of that HP dig, and lets face it, my cr250 was/is/will never b even close to my crf450. yes i will miss the sound of a 2stroke, the cheep cost to keep fresh parts on it, the light weight and the smell of the exaust. but i will not miss the lack of power down low, shiftin my nuts off tryin to keep up with all my 4stroke buddys, the lack of R and D the 2strokes r getting (sorry im not gettin a KTM) and mixing my gas (ok that last one is pussy) lets face it, we have gone to 4strokes for better of worse, and unless ur watchin the x-games, u will never c a 2stroke on tv again...
It would be better if they got rid of the overhead valves, put a reed valve induction, put an expansion chamber on the pipe and made it run on premix and made it fire on every up stroke instead of every other up stroke.