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jetting question for 09 yz450f

6 posts in this topic

Hi guys.. could someone please advise me. I put a fmf 4.1 slipon on my new 09 yz450f. Am i gonna need to change the main and needle clip position? I was thinking of using the 165 main that came in the bag of goodies, also moving the clip one position to the 4th position...any real world advise would be helpful..thanks.

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