1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 170Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 170

POWERHEAD
3If cylinder bore is tapered, egg shaped or out-of-round by more than 0.1mm (0.004 in, replace cylinder block

STANDARD CYLINDER BORE DIAMETER

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