I've recently purchased a 2001 400EX, it's pretty much been rode hard and put up wet, I gave $800.00 for it. My intentions are to go through the bike and pt it back in really good shape cosmetically and mechanically: plastics, nerf-bars, front bumper. As far as the engine is concerned I'm wanting to rebuild it, possibly put a bore kit in, cam, etc. I'm looking for ideas like best combinations to maximize performance, and also from a dollar value standpoint. Thanks in advance for information.