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Typically when this problem surfaces, it ends up being within the pilot jet area. I would suggest getting some Lucus Deep System Fuel Cleaner, or SeaFoam. (The Lucus works better initially for these problems) Seafoam can be used once in a while later to keep stuff clean and running nice. Use the Lucus first. Put in 3 or 4 ounces in the gas tank and run the engine, ride it if you can. Let it sit for awhile, ride it again, continue until you know if it will work or not. This could take a couple days. If it is not any better, the carb has to come apart again and be cleaned.