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Need help with YZ450F jetting.... Browns camp altitude

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My brother just bought a YZ450 but it seems to be extreamly lean... hard to start when cold, back fire while kicking over. What would be the correct jetting setup for riding in Browns camp altitude? Hope you can help.

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We had the same problem so we turned the slow speed fuel screw out 1.5 turns and put in the larger main jet and it stopped are problem. :)

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The '05 is lean and will be more sensitive. The jetting kits in the banner ads here will improve or eliminate the popping. Your other option would be to try richer clip positions and turn the fuel screw outwards to correct the problem.

James

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