Thanks for those that posted. See my post farther down in this thread for the stock and GYTR jet numbers. A bit different than I had read here, so something has changed. Okay guys, I have read a LOT of info here on jetting the WR450. I have gone though a LOT of searches as well. I am not a carb guy. I have a lot more confidence with computer programmed EFI than carbs. So I need some help from those of you in the know. 2009 WR450F. No exhaust or intake mods right now. Maybe later. Removed AIS. Will pickup the actualy GYTR AIS kit today, but now Im questioning this due to the jets that come in the kit. So for being in Oklahoma, about 650' Elevation, what size jets should I start with. With what I have read here, I have gathered by using the GYTR needle, I should be at 165 main, 48 pilot, and maybe a 50 leak????? Thanks for the help, Im a fish out of water since I cant just hook this thing up to my laptop and start making AFR adjustments.