Noise when idling

94 blaster with kawi 1100.

I'm not much of a triple guy but trying to help a buddy with his. Kind of hard to hear in the video but there's a raspy popping noise at idle. Does it twice in the video. Any ideas?

Stock bore 1100 with new pistons and seals. OEM carbs. Pop off on each carb is 24psi.

I'll upload the video to youtube and post a link. Says its to large to upload here.

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