Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 116Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 116

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TIMING, SYNCHRONIZING,ADJUSTING
A CAUTION
To avoid the possibility of drawing mercury from the vacuum gauge into the engine, do not run engine at high rpm speed or abruptly change throttle

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