Hey, I'm looking for a new bike and have pretty much narrowed it down between either the Yamaha WR450 and the Honda CRF450X. I'm mainly focused on the CRF450X and have learned quite a bit about it, but I don't know much about the WR450. I'm 20 yrs old, 6'1'' and 160 lbs and I work out regularly. I grew up mainly riding ATV's(4x4s). I live out in the country, in east Texas, and mainly ride around my house where there are many, many, trails from where oil companies have come in and drilled. The size of the trails vary from regular hard packed dirt roads, to soft 5 ft wide trails, to smaller less packed dirt made by other trail riders, but you can still ride them all relatively fast. There aren't any rocky areas besides small loose rocks. I ride a lot because it so close to me, basically in my back yard, just about every-other day. Thats basically where I ride and how often. My main concern with the two bikes is maintenance. I asked about this on the CRF forums and the only thing that concerned me was checking and changing the valves and pistons, just because I don't know how to do it and it looks expensive compared to a 2 stroke. So basically I'd like an idea of how often the oils need to be changed, and how often the valves must be checked and/pr changed, if you could give me it in the number of miles as opposed to hours so I can get a better idea. I know this doesn't matter but I'd also like to know how fast th WR450 can go, top speed, acceleration... and if you can wheelie it easily and slide around corners.. Thanks.