Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 197Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 197

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GEAR HOUSING
WARNING
To prevent accidental engine starting, remove (and isolate) spark plug lead from spark plug BEFORE removing gear housing1 Remove (and isolate) spark plug lead from spa