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

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Idle Adjustment 1 With engine in water, connect electrical harness and fuel line to engineStart engine and allow to warm up2 Properly adjust carburetor low speed mixture screwsRefer to "Carburetor Adj

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