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2007 25 yama 2 stroke carb air adjustment

It is not an air adjustment screw. It is a fuel adjustment screw.

The Yamaha 2007 manual does not give information for the adjustment screw. Should be an EPA plug/cap blocking access to the screw. If and when that plug/cap is removed, the procedure is to turn the screw inwards, counting the number of turns until the screw is lightly seated. Then use that as your setting when the carburetor has been cleaned and is being reassembled.
 
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