I've read a lot of threads about this but still haven't found exactly what I'm looking for. I'm pulling my 2004 DRZ400S out of storage sometime this week and getting it ready for the season. I live at 9,000 ft, but my first ride of the year is probably going to be at around 5,000 ft. I was going to pull the 145 main jet I'm running and put in the 150 adjusting the needle from the 2 clip to the 3rd, then re-jet once I got home. I already have the extended fuel mixture screw in place so I started thinking that I should just run the 150 jet set up and adjust the fuel screw to compensate for the higher elevation where I'll be doing most of my riding. I will be going down in elevation for rides until late May or June depending on snowfall, but riding on the street when I'm able. Are there any disadvantages with this? I'm new to posting on this forum, so please forgive me if I didn't get the right search words in and there is already a post about this.