When I pulled my carbs, I tore them down and went through them. The coasting enricher diaphrams could be stuck in the carbs, or just sticky. I used a metal dental pick with an angled tip to gently get under the edge of the diaphram, and pull it up to get a hold of it with my fingers. When you get them out, check to see if they are stiff. They should be fairly soft and flexible, not too stiff. If they snap or are too stiff, it's time to replace them.
I took some 2000 grit sand paper, and GENTLY sanded them to clean the brass up, and they work great now, slide in and out like they should.