32mm carb won't do you much good without an upgraded exhaust and big bore kit. The stock intake port on the GY6 is only 24mm, and even the "30mm" intake manifold is only 27mm at the port where it goes into the head.
A 32mm carb on a GY6 is total overkill. Go with the 30mm pumper and port match with a Dremel the cylinder head to the intake for a smooth transition.
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- Mike
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