Ok! After a little study, I bought a used 1998 WR400 for a good price. I have found a number of threads and articles on "free mods." Rather than going through searchs for each, is there one place that identifies what and how for the mods. As far as I can tell the "free mods" are: Grey wire, air cleaner cover, throttle stop, light blue wire, YZ cam timing and exhaust baffle. Did I miss any? By the way does anyone have any experence with the GYT-R baffle? Seems like a cheap alternative to expensive exhaust. Lastly, when I make all of these changes do I need to re-jet. I can handle everything else, but have always been a idiot when it comes to carb adjustments (other than stock). Thanks now for what I'm sure will be a lot of grief, I mean help, from all of you!