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A stubborn fast idle can be, as I just suggested, a manifold air leak. Do check that both the carbs and engine end of these are nestled squarely into position.
This is a well known ninjette prob.
They are also oriented marked "Head" and "Carb" end, if one is reversed it will play havoc.
Loosen the clamps and nuzzle them around a bit to make sure they are snug in the "detent rings" and square. As they age they harden and get more difficult to deal with. Also the clamps may close completely and be unable to tighten the stiff rubber completely.
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