2009 yz450f- exhaust question


1 reply to this topic
  • TH moto

Posted February 27, 2010 - 04:53 PM

#1

Just got a fmf 4.1 slip on for my bike and wondering for those out there that bought this pipe if they changed their pilot or main jet. I know on my last bike I went with 48 pilot and it made a huge difference in low end but not sure on this new bike.

Thanks for any info.

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  • grayracer513

Posted February 27, 2010 - 07:38 PM

#2

Read:

http://www.thumperta...ad.php?t=327405





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