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Jetting for a yz 125

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Hey guys I got a question for a friend. He moved to Wyoming and he just got his bike over there. It's a 2003 yz 125. He sits at 4800 feet in elevation and his bike is slugish and only runs true when he's "on the pipe" as he says.

Any way he knows he needs to reject but not sure what to. We're both assuming its on the stock jetting an needle clip. He used to ride here in wa with me at damn near sea level.

What do you think he should re jet to? Change the main and pilot and needle? Or is it just as simple as main?

Any help would be nice, thanks:thumbsup:


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