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FCR Conversion - 39 or 41

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I have a 09 DRZ400SM which I did the big bore install on.

I upgraded the exhaust and did the 3x3 airbox mod.

It still has the stock carb.  I'd like to upgrade to the Keihin FCR and see that the 39mm model is widely used.  Is this also the recommended model for engines with the big bore installed or should it be the 41mm?

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