I found that the cross over tube helped
Smooth out the burble you talk about at 5500-6000k rpm. I then made a boost bottle out of copper copper plumbing materials to see if it would help without having to spend a small fortune on a moose racing bottle. Which it did, I then fitted 6mm Reed spacers and found that it practically ironed out all of that 5.5-6k burble.
I did see your comment regarding cutting the spray bar down, it may or may not help. But if you've followed the Dave F mod and left that bit out. It's certainly worth doing the job correctly to rule out any teething problems.
Hope this helps.
Smooth out the burble you talk about at 5500-6000k rpm. I then made a boost bottle out of copper copper plumbing materials to see if it would help without having to spend a small fortune on a moose racing bottle. Which it did, I then fitted 6mm Reed spacers and found that it practically ironed out all of that 5.5-6k burble.
I did see your comment regarding cutting the spray bar down, it may or may not help. But if you've followed the Dave F mod and left that bit out. It's certainly worth doing the job correctly to rule out any teething problems.
Hope this helps.