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04 kx125 high altitude setup?

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Any tips on how to jet a kx125 for high altitude? I have never really messed with carburators (other than cleaning) and I am not sure what adjustments to make. The bike will be ridden mostly from 6000-8000+ feet.

Thanks!

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You will definitely have to jet leaner. I have no experience with altitudes higher than about 3000 feet, so I can't really advise you on how much leaner.

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Sorry, I forgot to mention that I knew that I have to drop probably 2 sizes in the main jet. My biggest question is, does anything else need to be adjusted?

The bike seems to run fine right now (starts first kick) but I have never ridden a 125 so I have no idea if the engine is performing anywhere near how it should (I have only taken it around the neighborhood so far).

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Not only will you need to drop the main jet but you will also need to raise the clip on the needle, go to a smaller pilot jet, and back the air screw out. I will take a look in the manual tonight when I get home and see how much of a drop it recommends.

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I just answered this a couple of days ago...

"@ 6000 ft I run 390 main, 32.5 pilot, second clip on a leaner needle and a leaner slide." And two turns out on the air screw.

The mikuni specs call for a 370 main(in warm weather), but I'm kinda lazy and don't wanna change jets all the time.

Always run 32:1 (or even more oil) and jet from there. Look around for jetting guides on this site and honor those posted by Chokey, he knows of what he speaks.

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