1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 200Get this manual
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CYLINDER BLOCKCRANKCASE
Cylinder Bore Specifications Standard Bore 2.32282.3236 in(59.00-59.02 mm) Oversize Bore 0.10 in(0.25 mm) 2.3327-2.3335 in(59.25-59.27 mm) Oversize Bore 0.20 in(0.