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is the carb progressive secondary?
if so, is it vacuum valve, thermal controlled?
if use of one barrel, yes you want the whistle of atomizing...and that also leads to a very decent surge into the second barrel. The samuri is not that old, I assume progressive.
30 is doing good. samuri with larger wheels still has low gearing, but it helps. and also, do not remove engine driven fan, that is a helper not a killer. the downdraft loves it. it is an "anti-thumper", carbs like smooth.
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