Mercury Force 9.9, 15HP Outboards Service Manual, Page 131Get this manual

Mercury Force 9.9, 15HP Outboards Service Manual, Page 131

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4 Measure the cyli nder bores with inside micrometer or dial indicator Measure 14" (6.35 mm) down from top Measure 14" (6.35 mm) up from exhaust portMeasure 316" (4.76 mm) down from intake port