Hello again… well the bike is ticking over quite well… but as soon as I rev it it wants to cut out… if I look down the 4 air intake there are 4 slider things… only 2x are moving up when I rev it, the far right and far left, the 2x middle ones stay still, is the right? not got a clue 
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Just to add the revs take ages to drop back down when it does rev
That’s not right, they should all move together, they will fluctuate or bounce up/down as you rev though, they’re never at a constant level. Maybe the pistons are gummed up, diaphragms are not well, (split) or the diaphragm vacuum passages are blocked.
Smithy.
Hi the carbs have been totally over hauled… they move freely… might have to dismantle 
thanks for the advice. Sean