Hi, I would like to know the size of this carb from the numbers on the side of it. I tried uncle google but it is not very obvious. the carb is a Keihin FCR 3925D.
What say you most knowledgeable people? I am going to stick it on my DR650 all going well.



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I am encouraged that what I have bought is a 39mm and look forward to having at least half the wheel standing grunt that a KTM 520 seems to have.

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