Hi, I am going to look at a 2004 WR450 in a few hours to buy as a replacement to my 426, could anyone give any advice as to what to look out for? I know the usual consumables etc but are there any known problems with the 04 bike? Also, how can I tell that its not a 2003 model? anyone know what looks different or engine/ frame numbers would be brilliant !!! Many thanks Trev.