Hey Everybody. I'm a new guy. I hate being the new guy. I've done a LOT of reading here. You guys seem to be waaaay above the average intellegence level of most of this type of site. kudos. I'm planning on buying a left over, never used WR450in a 6-8 weeks, "if the good Lord is willing and the creek don't rise." A dirtbike is something I've wanted for a long time, but was never in the cards because other responsibilities came first. But it's going to be a reality real soon. I pay cash. I had a CR125 years ago. I currently ride a 929 on the street. I've done track days, the whole street bike thing. Anyways... My dealer is less than 5 miles away. That's a good thing. He's into off road riding. Hare scrambles, etc. Probably hangs out here, but I don't know that last part for sure. In other words, my dealer is one of us. He'll do the free mods for me. More good stuff... My real question is, After it's set up properly, been re-greased, jetted properly, break in valve check, How maintence intensive is a WR450? I plan on riding gravel roads, fire roads, abandoned srtip mines, some trails, some street. By dirt bike standards, I'd say medium/light duty as far as what I'm doing, but I plan on riding a lot. Having said all that, will this engine go 10,000 miles without a rebuild? How much is a rebuild going to cost? Do I really need to change oil every other ride? Does it give you any warning before the engine lets go? Thanks for your patience.