Billy, It used to pull away alright didnt it? If so then what ever you have changed has screwed it up.. or your a numpty and got everything in backwards. Even with mods you have even stock jetting shoudl be ok so it must be something is blocked or youve put it togther wrong. Get Stace to have a look at it his V4 runs ok
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If I have to take the carbs off once more...