hey guys i have a '99 XR 250 as of right now. i am looking into newer bikes and have recently been looking at CRF 450s. i really like the bikes, but the high maitainance just isnt my thing, so many things go wrong with them and i hear all about the valves and whatnot failing very early. so, with that said, i am taking a look at these here WRFs, probably the 450. coming from my XR what could i expect from performance difference, prices, and problems. sry for all the questions. thanks!