as long as the idle is smooth and that it runs fine when revved I wouldnt worry about it.... also if you hear it without the airbox and tank over it, you will notice it quickly... carbs tend to be a bit noisier than FI.... it has been along time since I have had any keihins on a bike so I am reaching a bit on remembering how noisy they were... not since my old 81 gs1100r... LOL so it has been about 11 years or so.... LOL
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