04 giant flat spot at 9.5k rpms after rear tire change

i just got the bike in april and before i got the rear tire replaced it was smooth as silk then after i got it replaced when i was riding it hard after breaking in the tire the engine cut out for half a second in the middle of a corner and i heard a backfire now when reaching 9.5k rpm with even a little load on it it will cut out for that half second i havent had the issue at idle bike was fully warmed but it does kinda scare the shit out me when it happens even if i anticipate it it will still rev out to red line after the hiccup i think its carbs but idk and i dont wanna keep dropping hundreds taking it to the shop but i thought id try here and see if any one else has had this problem
 
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