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Message: <blockquote data-quote="krakum1967" data-source="post: 125705" data-attributes="member: 3691">Its an enrichment circuit.  It is added on to the side of the primary side.  It seems that it is designed to add fuel at idle I believe from the little bit of reading I did on it.  It has been reported by Joe and other sources that it can be the source of odd idle issues.  To remove it or in this case plug it removes it from the circuit.  It makes the carb more of a straight carburetor without all the added stuff that can clog, or potentially leak as it is diaphragm based.  It reminds me of the accelerator pumps you see on the Keihin carbs they put of the CB900 or CB1000.  Its on the same side of the carb as the fuel inlet, and sits behind that cylinder that hangs off that side of the carb.  I will eventually pull that too, but the rod its connected to likely needs to be removed by removing the top of the carb.  I will do that when I rejet.I may be off base though, I pulled it to avoid issues as I am having a murphy's law kind of week.</blockquote>