Fmf pipe on yz450f

Yamiguy51
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Yamiguy51
Edited Date/Time 8/18/2013 6:22pm
Would putting a slip on fmf pipe on a 14 yz450f make the bike run to lean? Do you need a efi tuner??
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Preston412
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Preston412 8/18/2013 5:06pm
8/18/2013 5:06pm
It shouldn't but I know there is an issue with the 14 backfiring when it gets warmed up. call dr. D or jgr engine department and see if they have a map that will help you.
swtwtwtw
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swtwtwtw 8/18/2013 5:16pm
8/18/2013 5:16pm
I know that the '14 stock mapping is on the lean side out of the box. one can adjust that with the tuner thing-a-majig...
Yamiguy51
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Yamiguy51 8/18/2013 5:42pm
8/18/2013 5:42pm
Thanks guys
Collin_Beverly 8/18/2013 6:22pm
8/18/2013 6:22pm
I have a slip-on on mine and its runs better. It doesn't pop as much. They come a little rich not lean.

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