First off I know there is hundreds of jetting questions including a jetting sticky but everyones set up is alittle different and I have never rejetted anything. If you could please give me some advice on exactly what jets I need to change and to what size. Hopefully this is all the info you need, I have a bone stock 2005 crf450x with only 11 total hours on it. The only change ever made was I turned the fuel screw out 1 6/8 turns to help with idle. Im wanting to open the top of the airbox, do the stock exhaust mod, and the AP mod. I dont race I only trail ride between the altitude of 1500-5000 feet. What is the best jetting for this set up? Also, there is a bog if you open the throttle up quickly from idle but once your moving it accelerates great and sometime once it gets warm it wont return to idle like normal and seems to hang alittle? What would cause this? I know there are lots of questions here and you have probably heard them 1,000 times (sorry) but any help you can give me would be greatly appreciated! Thanks for your time.