Release the circlips on the front and rear rubbers, on the rears enough so they can just go over the lip but not enough that the screw come out.
Gently work the rear rubbers lose, you may have to use something thin but blunt, squirt in some WD, now start to pull the carbs backwards while moving them up and down, DON'T go mad. Just enough to get the fronts lose, once lose little WD in the fronts, repeat pull/up/down and they should come off, it's tight but they will move far enough backwards to allow the front to be clear of the intake rubbers.
Job done