Fazer 600 Carb Sync - Problem

[Kentish]

Hello everyone. I tried to balance my carbs today on my 2003 faxer. Its done 6000miles now. I adjusted carbs 1-4 but just couldn't adjust cylinder 2. The guage is lower than the rest. I tried another guage on it just incase the guage was faulty but its not and I got the same reading. I have also checked the carb rubbers. They are like new.. I am at  a loss. Please help me!!

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