1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 150Get this manual
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Inspection Cylinder Bore
Diameter (Standard) Taper or Out-ot-Round Maximum Limit Diameter 0.020 in(0.50 mm) Oversize Taper or Out-ot-Round Maximum Limit
2.48032.4809 in(63.0063.015