Being from Michigan, I haven't really had to deal with this issue much. There's a race coming up in a couple weeks in a city with an elevation of about 5000 feet. I currently ride at about 2600 feet and my bike runs great. (maybe a touch lean when it gets cooler, but not enough to worry) Do any of you guys bring extra jets with you just in case? If so, what do you think..should I just bring a slightly leaner pilot and main. Or should it be just fine. I don't want to drive 5 hours just to have my bike run like a turd. Nor do I really feel like tinkering the morning of raceday. It's a 250 with a big bore kit (280) running on VP110 and mixed at 32:1 if that helps. I looked at the jetting page a bit, but couldn't really find a great answer. Any input would be appreciated. Thanks dudes.