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The idle can be set by turning the Phillips head screw on the top off the carburetor. It is labeled number 7 in the picture below. Turning it in will increase the idle speed, out will decrease it
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I did not realize you had a problem with the engine running. I would do a thorough cleaning on the carb. Pay special attention to the float valve and make sure it is opening and closing. Here is a good PDF that Honda put out on how to clean their carburetors