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Jetting for 03 yz125 at Wyoming elevation

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Hello. I bought my bike from a guy in the lower elevated part of Colorado and he has a #420 main jet in the carb. I am doing a carb rebuild but my bike died on me last night and I'm pinning the issue on bad jets. Does anyone know what size jet to use for a Cheyenne, Wyoming altitude? We are at about 5500 ft above sea level. Thank you!

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