I thought this was a very good article - right up to the author's (Brendan Lutes) conclusion at the end. Even though he was consistently 3 seconds per lap faster on the 2-stroke, he still says he would pick the KX450f for his race bike! Unbelievable!!?? How much money does the average racer throw into their 450f and still not pick up 3 seconds per lap??? Plus since 500's only rev to 6000-7000 rpm, top ends last forever, no valves to replace - ever. Just goes to show how ingrained the 4 stroke mentality is to the mainstream magazines. Even when something is clearly better, they still cannot bring themselves to endorse it.