Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 131Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 131

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Valve Clearance NOTE:Valves should be adjusted when engine is cold
the driven gear aligned with corresponding marks on powerhead1 Position the driven gear for cylinderor #2 (see instructions fol