I picked up an 03 WR450 from a buddy and just got a chance to ride it when I got it home. The bikes from Tucson and I'm in North Texas. Needless to say there is some altitude difference. About 6000 feet I think. When I hold the bike at steady throttle there is some lurching, when I'm on the throttle it accelerates fine. There is popping on deceleration. I didn't get any needles with the bike and he's mailing the manual. I'm supposed to go ride Thursday is there anything I can do adjustment wise to help me until I can get it jetted properly? Thanks for the help.