Keihin 39mm carb

Would someone tell me if the Keihin carb can handle a 434 big bore kit on an 06 DRZ or should you just go with the bigger 41mm carb?

No, the 39 is fine. The 41 is used for Super Motos only when they have the big bore and stroker done along wit the RHC 187 cams. The full boat. If you put the 41 on your bike the way it is, low speed running will suffer greatly.

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