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xr 400 Jetting question

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Ok guys, my buddy just bought an xr with a 440 kit basically stock engine and exhaust other than that. The jetting is of... it was jetted for sea level and we ride mostly around 3-6000ft. I don't know what needle is in it, but I was wondering what jetting you would recommend.

Thanks!

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Ok guys, my buddy just bought an xr with a 440 kit basically stock engine and exhaust other than that. The jetting is of... it was jetted for sea level and we ride mostly around 3-6000ft. I don't know what needle is in it, but I was wondering what jetting you would recommend.

Thanks!

probably dropping down a jet size or two to elevation changes. Check these charts out provided by honda. This should help figure out a rough estimate of what jets you should use.

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I ride at 3000 to 5000 feet. Here's what I did.

1). Yank the backfire screen and snorkle.

2). Drill three 1/4" holes in the end of the exhaust but retaining your arrestors integrity(assuming you have a stocker)

3). Go to a 58 pilot and 158 main.

I live in the high desert in cali. It runs like a champ now.

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