Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 115Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 115

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TIMING, SYNCHRONIZING,ADJUSTING
NOTE: Th carburetors are synchronized by adjusting the intake manifold vacuum on the carburetorsUse Carburetor Tuner (91-80964A 1) to measure the vacuumINSTALLING

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