stuttering fzs 600

[red98]

That's disappointing... only partly cured.  
At least the fact that it revs OK with no load implies the sparks are good now. The remaining problem certainly sounds like air or fuel in short supply.
I too find your slow jet settings a bit of a puzzle, all three sets of carbs I've had have run fine on with the adjuster set to slightly less than 2 turns. I'm currently overhauling the set I pulled out a few weeks back. When I've got them fettled you're welcome to borrow them for diagnostic purposes.

your a top man FAZERIDER....bought my own spare set last year but turned out to be bad,CRH helped me out with another set which made no difference too stutter,had my origanal set look at by local mechanic friend and found no problems..
iam with you on "air or fuel in short supply" and as i have improved things with the recent changes iam going to bypass the pump and filter ,ive fitted a new k&n filter but will take it out to see what difference it makes..
          before i do anything iam going to read through this whole thread and take notes as i go......iam sure the answers in there somewhere