I have followed lots of guidance you have given to other people in the WR400 Empire, but I'm still trying to understand the Jett-i force. I have a 00'WR400 Yz timed, 175 main, 48 pilot, 2 1/2 turns on the screw, DVR needle (stock YZ) in the 4th position (Tried 3rd already), plug is a very light tan I live in southwest Ohio at about 500-700ft. The bike rips just off idle to almost all the way to the top (Think I need to go to a 178 main) but my problem is that she stumbles from idle to some where between 1/8 - 1/4 throttle. Do you think the needle is too lean or is it something else? Thanks for all the helpful info you have given.