Hi
I've done a lot of work on these bikes. I have all the jets and have tried all sizes.
At altitude you are going to have a lack of Oxygen. So the bike will run a tad rich. But as these bikes are jetted lean as standard so it might not be an issue at all. They should really be re-jetted from standard to get the best out of them.
Now, I have to admit I've never taken a 650L to altitude so I can't confirm this.
You will get years of endless information about jetting XR650L's on Thumpertalk.com forums.
You could also read this and contact Chris. He is in the Andes now on a XR650L
http://www.horizonsunlimited.com/hub...-revisit-96042
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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