The new '04 CRF450R features many minor changes, which slim it down slightly over the '03 model.
Engine changes have also given the new model more bottom and midrange power also, Honda claims the new 450 delivers 55 bhp at 9000 rpm and 36.5 lb./ft. of torque at 7000 rpm.
However, the new CRF450F will cost $200 more than last year's, going from $6299 to $6499.
for more details:
http://www.cyclenews.com/ShowStory.asp?HeadlineID=4760
http://www.motorcycledaily.com/15may03honda2004crf450r.htm