How long did your bike sit idle? Did you treat the fuel in your tank with Stabil or another gas treatment product? It could be shellac build-up in your fuel system.
I like to run Seafoam in my fuel about every 6 months or so now that my GZ is no longer my daily rider. 1 oz. per gallon capacity. It keeps everything squeaky clean.
You might have sediment on the inlet screen of your petcock or build-up behind the diaphragm. Options : drain tank, check petcock inlet, take petcock apart and clean, and if all else fails, clean carburetor.
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