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It may be caused by a poor needle and seat. The needle or seat may be clogged with debri allowing fuel to continuously flow into the bowl and out the overflow tube. Check this theory by removing bowl, and reinstalling fuel line and carb to engine and allow fuel to flow. Once flow has begun gently push float into the most highest point. Fuel should shut off. If it does not, then you need a new needle and or seat.

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Q: What causes gas to pour out of the overflow hose on a new mikuni carb?
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