Ok! I feel a little stupid asking this question but I dont want to waste my time ripping it apart. I cant seem to find the pilot screw on my 99 WR400 carburator. My 05 YZ was easy but I dont know I cant seem to find it while its installed on the bike. Can someone tell me were it is and which way to adjust it. My bike back fires when I let off the gas so I believe its running lean. Don't beat on me to bad!