FCR to KEIHIN carb swap ?'s

[SHIFTx450]

What is expected if I were to go from my 06 FCR carb to an 04-05 keihin carb??

I've read about the woods guys going for it, but what's the pros & cons? How do they run?

[SHIFTx450]

Motor has lightened flywheel, ported head, 06 CRF cam, JE 13.5:1

[airmobile101]

Less thumb fatigue and a smoother power delivery.

[SHIFTx450]

Does it take away any? Like loss of snap, or power?

[fastredrider44]

Yes. Definately a loss of snap. As for power, the 04-05 carb won't do as well on bottom, but they usually pull a little harder on top. I don't have any numbers to prove that, just going by feel. But if you like the snap, stay with the FCR.