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The intake measurement on these carbs are 30mm but the inner throat may be in the 22-26 range depending on make and model. It seems Mikuni and Keinin both measure this way but most people use the intake size when discussing carbs.
I don't know what would be gained by going larger as this size seems optimized for this size engine and a larger carb would make dialing it in a real bear. Imagine putting a pair of 4 barrel carbs on a 4 cyl toyota corolla.
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