So im looking at a 450. The bikes in my area in my price range are 2002-2004 crf 450's and 2003-2004 yz450f's. I know there will probably be some bias towards the yzf's but im a little unsure of the four speed tranny. Do any of you guys have any experience with the honda's of the years im looking at? Im concernced with the valva life and overall durability of the crfs. I have owned several yamahas and none have EVER given me an issue. What would you guys go for? How was the 2002 crf 450?? How bad is the 4 spd yzf tranny?