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The screw that connects to the pipe for the whole carb?Well I have had a somewhat similar problem with flooding it Jett flooded while I was trying to start it. The way I fixed it is by removing the spark plug, emptying the carb bowl with the screw that’s on it, turning the petcok in the off position, draining the fuel line then pedaling the bike with the clutch engaged but not too fast to where’s i damage the cylinder wall.