A while back there was a post about the Boysen Acc pump cover and jetting changes that were supposed to make similar results. Anyways someone posted that changing the leak jet from a 70 to a 60 was supposed too have the same results. All I can say is that I have an 04 450 and that jet is no where to be found in my floatbowl. I'm not sure about 03 450's, 250's or WR's but my bike does not have a leak jet. Someone posted a pic of where it's located and my doesn't have one. Anyone else run into the same thing?