Diaphragm replaced recently, one with really big hole but the symptoms was rather a loss of power at higher revs and the carbs were running really out of balance.
Choke cables stuck can give the same symptoms but I have checked that and even replaced the gaskets on the enrichiner (Choke) housings as well.
When the carbs were off I went through them to check that everything was OK and I always push the piston up to see if they return to their normal position without getting stuck, I do this with the carb assembled by sticking my finger in from the air box side. You can also check that the small tabs on the diagram has been correctly located with assembly as the half moon shape at the bottom of the piston will not be central in the throat of the carb.
I also make sure the cables is not stuck but everything OK here when the bike start to pick up revs on its own or keep revving when you close the throttle.
Impossible to balance carbs because it either dies or start to rev.
Thanks for the ideas but I think that this problem can also be electrically related by not having a regular spark????
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