Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 270Get this manual

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8) The No.3 carburetor is the synchronization base carburetorTurn the No.1 and No.2 adjusting screws so that the vacuum difference between each cylinder is 20 mmHg (0.75 inHg) or lessSnap the throttle

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