Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 141Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 141

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Valve Springs 1 Check each spring under load on spring testerReplace any weak springs55796
[Valve Spring Free Length 1.4911.569 in(37.85 39.85 mm)

3 Check each spring on flat surfac

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