I bought a WR250f new this past summer (2004) and it seems here in Michigan that winter is almost here, so I decided to finally check my valve clearnces and grease the rear end, guys and gals, you should also do it. I found a fair amount of standing water in the linkages with some rust forming. Take out the "string cheese" and re-grease with some good gooey stuff! I used PolyLube from Park Tool. I work for a bike shop so I get it cheap. It is definetly a good thing to do. I found that my swingarm pearings were the worst. So just a friendly reminder so you dont have to visit your local dealer prematurely. That stuff is for two-smokes!