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This procedure was performed when I had some other work done on my carbs. I suspect the plugs are on only American Bikes. I also suspect it may be EPA related. Why else would there be a soft aluminum plug over an adjustment screw.
I did some searching on the web and found a reference to unplugging the idle mixture screw.
There was also another piece for replacing the idle mixture screw for a CVK on a Harley. It stated to remove the soft aluminum plug, remove and replace the idle mixture screw, seat it gently, and back off 1.5 turns. It also referenced EPA and state requirements.
Since the various Triumph chats mention 2.5 - 3.0 turns, I suspect it enrichens the idle mixture.
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