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More then likely it is not getting enough gas. What you are going to want to do is to clean out your carburetor. First shut your fuel off, then at the bottom center of the carb is a 1/2 inch bolt head. Remove this and drop your float bowl. Clean the float bowl area and then the small bolt, this is your main jet. make sure you run a small wire like a bread tie through the little holes. Reassemble and you should be up and running correctly again