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Keihin Carb Model Numbers(buying a used carburettor)

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Hi. 

I am on the hunt for a used Keihin FCR MX-39mm carburettor and have come across one online.

however, my current carburettor that needs replacing has a model number of: '3900A CRC12', written on the side near the float bowl.

The carburettor I have come across that I am considering purchasing, has a model number of '3900A BQD23'

they are both Keihin FCRMX 39mm Flat side carbs but im just wondering what the difference between those model numbers are? or what the last 5 digits mean? as those last 5 digits are totally different. I'd really appreciate any help on this matter.

Edited by pdee4t

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