yz400f jetting info

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.

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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