Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 60Get this manual

Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 60

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Timing Adjustments IMPORTANT: If link rod was disassembled, make sure that 1116" (17.5mm) dimension Is retained
ACAUTION
Engine is timed while cranking engine over with starter motorTo pre