They are the same size etc as stock NSR carbs.
I'd like to bet the RS would make just as much power on NSR carbs. My NSR made more power and produced more over rev with NSR carbs compaired to both 38 and 39mm PWK's. It also makes more power than the RS (by a fair margin)
I do agree PJ/PWK's are better to set up.
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If I have to take the carbs off once more...