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It sounds as though it's not a missfire, but a flat spot.
My S2R did this very badly after I altered the exhaust & was especially noticable on roundabouts when either just feathing the throttle or slight excelleration.
I reckon your bike is running to lean & possibly the TPS needs setting up, book it in to your local dealer & ask them to check the CO% & adjust the TPS, that will probably cure it.
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