Hello world, I am rejetting my '08 CRF450R for altittude (4200-6500ft). I have decided, based on this forum and the owners manual on a 160 main jet and 2nd clip from the top on the needle. Stock is 178 main and 3rd from the top on the needle. My question involves the pilot jet. It seems no one changes the pilot but my bike has an intermittant bog when held at steady RPM around 1/2 throttle. I was told that this is the pilot circuit being to rich. The fuel screw is all the way in. I have a 40 pilot jet to replace the 42 stocker but I am curious, should I put it in while the carb is apart? Or will the main jet and needle changes possibly correct this problem? Any experienced help would be appreciated as this is my first 4 stroker and I have been out of bikes for over10 years.