yz400f jetting info


1 reply to this topic
  • XafiX45

Posted February 05, 2008 - 01:31 PM

#1

I have a 99 yz400f and i just installed a powercore 4 slip on and powerbomb header. I was wondering if to get my peak performance out of my bike if i would need to rejet it.

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  • 642MX

Posted February 05, 2008 - 06:18 PM

#2

I have a 99 yz400f and i just installed a powercore 4 slip on and powerbomb header. I was wondering if to get my peak performance out of my bike if i would need to rejet it.


Yep, jetting it will help. Get a JD jet kit from the TT store. They work great and they are very easy to install.





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