what size jet should i start with?

Whats your elevation?
Im at 3500 feet and have a fmf fatty/powercore2 combo.
Also a K&N pod and vented airbox. I run a 230 and it has a beautiful golden brown tint to it. Maybe a tad rich but close enough for me.
 
Its deff not running lean.
It hasn't had any heating issues or anything. And i did a plug chop (Well, with the space i have) And it came out with a nice golden brown tint to it with a darker ring about 2cm down. If it was really lean it would be white.
 
uni......i'd start at a prolly rich 290 and work my way down
350.....i'd have to agree you're prolly lean, have you even ever try'd a bigger jet???? if remember right i'm see'in alot of fmf combo's at 270, possibly bigger with the dirt flowing k&n and no lid, i'd start in the 300's and work down if i were you