I'm a bit mystified at present Paul. In an earlier post, you said it will run perfectly without the elbow or insulator. Now you said it won't run with the insulator unless you block the idle air bleed. Can you verify that it will run without anything at all on the intake flange of the carburetor, but it won't run with the insulator on unless you block the idle air bleed?
If you find it won't run either with or without the insulator unless you block the idle air bleed, that will make sense, but at this point I don't see how putting on the insulator alone, can mess it up in such a way that you have to block the idle air bleed.
