What size jet for 300EX?

[#420]

Just wanting to see what others are running in their 300's with header and pipe? Its a closed end pipe with 8 discs. The air box lid will remain on due to the type of riding I do (mud/high water). It also has a K&N filter.

It has a slight stumble if you blip the throttle..Im hoping a jet change will fix it. Just wanted to get some ideas on what size jets others are running. Any help would be greatly appreciated!:)

[ZSK]

I'm running a 132 with full system, no lid. Try adjusting your fuel/air screw. Might help some. I think just a pipe would be around a 128 or 130.