FMF exhaust jetting 2008 yama

2 replies to this topic
  • lanny574

Posted March 21, 2011 - 10:45 AM


putting a powercore slip-on my 2008 yz 450f what do i need to do to the jetting

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  • curtis515s

Posted March 21, 2011 - 01:48 PM


putting a powercore slip-on my 2008 yz 450f what do i need to do to the jetting

I have the same slip-on. Put a 48 pilot in and an adjustable fuel screw. The backfiring on decel will be almost eliminated.

Edited by curtis515s, March 21, 2011 - 06:02 PM.

  • ttr250dude

Posted March 21, 2011 - 05:51 PM


And a 165 or 168 main jet. Popping on decel is a good thing. If it doesnt pop, you are running rich.

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