Hey, new to the site and need some help. My son has a predator 90 it has a FMF exhaust and i just bought a new air box. It is the E-ton/predator 90 air box (much better than stock) the intake of the box is bigger. I think i know the answer but do i need to rejet? If so what size is stock and what sixe do i need to go too. Also do I need to change the pilot and the main or just the pilot? Thanks,
Kevin

 

what kinda filter you running? if you put a pipe and different air filter like a uni of k n filter you will need to rejet richer, I cant say what size but i would buy a few sizes bigger and do plug checks and see which one looks and runs the the best to be safe.


hoyt

 

Let the plug color guide you.

 

thanks guys, it is the same filter bout a better air box and the intake tube is bigger. so I am thinking it will need to be jetted.