FMF exhaust jetting 2008 yama

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

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

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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