1971 Evinrude Fisherman 6HP outboards Service Manual, Page 41Get this manual
BEARING
CLEANING, INSPECTION, AND REPAIR
CYLINDER BLOCK AND CRANKCASE Check cylinder walls for excessive wear and check cylinder for carbon accumulationCylinder walls wear in various degrees depending on lubrication and conditions under which the motor is operatedMajor portion of wear is in the port area and the area covered by ring travelCheck cylinder for size and wall straightness by using an inside micrometer or dial bore indicatorRefer to Section for specified dimensionsReplace cylinder block or rebore block for oversize pistons if wear is in excess of .002"Pistons and ring sets are available .030" oversizeNOTE
If your shop is not equipped to rebore cyl-