FCR carb Help

Hi everyone,

I recently purchased a 2002 DRZ400E Never owned a DRZ and i have a few issues.

The bike has a FCR carb and I notice there is what looks to be a thumb screw on the left side of the carb. I have not been able to find out what this is for, I've seen it in every picture of a stock FCR carb.

Idle speed adjustment.

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