Colorado jetting question

I have a 2003 DRZ 400 E, removed snorkel, and a procircut slip on. Im taking a trip to Colorado and riding around 9,000 to 12,000 feet. Right now i am using (and have used in the past) a 140 main jet and the needle on the 3rd clip. Last time it felt like it didnt have much power on take off, ran fine otherwise. I have the james dean kit, but seeing a couple of these post made me think his smallest jet was a little big for that altitude. what would be the best way to go on this?


which JD needle?

The needle i am using is the stock needle, i just bought the 140 main jet.

ok,well the stock needle works fine at those elevations.3rd needle clip is to lean.4th is the leanest you want to go.

140 main jet is fine.

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