I guess if the servo isnt off an MC18 its possible that unplugging the wire under the seat might screw the servo up. Maybe try and get the bike on a dyno and see if its still restricted. If it makes good power in the higher gears then maybe someone at some stage has already somehow derestricted it. That way you coudl just leave it how it is.
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If I have to take the carbs off once more...