1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 63Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 63

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MAXIMUM TIMING 1 Hold control arm so that maximum spark advance screw is against stop2 Crank engine with starter motor and adjust maximum spark advance screw to align the specified BTDC timing mark on

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