I just got on my old 04 250f and i keep noticed that it FEELS significantly heavier and sloppier than my 07 450f. This is actually a major factor in me going with the "heavier" 450f in 07...it still felt lighter than my ole 250f. So what exactly is it that happened between 05 and 06 that made these bikes feel like night and day? I know they switched to the aluminum frame....but that really didnt shave that much weight, did it? Was it simply how they reconfigured the weight distribution? Im just trying to make sense of this becasue im always in awe after gettin on my old bike...especially since its only a 250f.