Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 158Get this manual
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Balance Piston 1 Measure the balance piston diameterReplace
Diameter (Standard) (Oversize) 0.010 in(0.50 mm)
(Oversize)
2.55702.5578 in(64.950 64.965 mm) 2.5669 2.5675 in(65.2