Jetting w FMF-Q4 at 10k feet?

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  • TC33

Posted June 15, 2009 - 09:24 PM


I just got a new 09 yz450 and have the fmf q4 spark arrester on its way.
I want to ride this weekend and was wondering if anybody had run the stock bike with the fmf q4 at 10k and what main jet they liked?

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