I've put my 400F back together and today I decided to sync the carbs....
The issue that I am having is that after a few revs the carbs don't fall back into adjustment and I found that the adjusters/arms aren't returning properly. I've had the carbs off, verified that there isn't any type of bind, and almost suspect that the springs holding the cups inside aren't "springing" like they used to. Has anyone else run into this problem and if so did you find replacement springs?