So I'm looking at a 2004 wr450f in SM trim that has a 30 over big bore, and the guy says he doesn't know what kind of kit it is, as the PO had installed it. He doesn't know the exact hours or miles on the motor either, but he says it runs fine. It has a full system, jetting properly, and K&N filter. (that's all the info I got out of him at this time). I'm a honda guy at heart but this bike is a good deal and I've always wanted a sumo! haha! So My questions are what are the specific things to look for on this bike, and adding that is had a big bore? I know they made some needed updates and changes on the '04 model. Any help is appreciated!!