they are 4mm X 0.7. I hope you didn't damage the diaphragms with air pressure. Your problem could be created by ethanol, it attracts moisture and is bad to leave sit in carbs untreated. I use Stabil Ethanol Treatment in the fall in all my gas engines that will not be used over the winter. It can cause corrosion in the carb passages. That being said it probably didn't cause enough to clog a float valve, more likely smaller passages but it could if let sit long enough. If it is both carbs for you I would still be looking at the fuel lines back. I really can't see both float valves clogged at the same time. Not impossible but unlikely.

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