So, after being a good little TT'r and searching, and reading, and searching, and reading...100's of pages on this subject, and then drinking a few cold ones, just to help the mental process out sorting through it all...... I MIGHT have this figured out... Got to go in and do some TLC in my 04 WR 450, piston, rings, check valves, make sure everything else is ok, and a new FMF 4.1 slip on, so, hey since I'm in there, lets talk about cam's (little did I know...) So, here is what I got out of a day of post diving: - Go with a '04 YZ Exhaust cam only, the intakes are the same between the WR and YZ for '04. Now, what is STILL not so clear: - Does this, or does this not, mess up the electric start due to the decomp pins? - Will I (and if so, how much), loose bottom end with this set up? As a FYI bike already has air box opened up, grey wire is done, and so is the throttle stop. As usual, any guidence in this area would be greatly appreciated!