1971 Johnson 125HP outboards Service Manual, Page 54Get this manual
hIf necessary to remove wrist pin, remove wrist pin retaining ring, using Truarc No1 pliers (Special Tool #303857)See Figure 5-19
One side of piston is marked "LOOSE" on insideSee Figure 5-20When wrist pin is to be removed, "LOOSE" Side of piston must be up and driving tool must be applied to loose sideAlways drive froin loose side to tight side, being careful not to distort pistonSee Figure 5-21iDrive wrist pin through to free piston from rodCLEANING, INSPECTION, AND REPAIR CYLINDER BLOCK AND CRANKCASE Check cylinder walls for excessive wear, and check cylinder ports 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 dimensionsIf wear is greater than .003", replace cylinder block, or rebore block for oversize pistonsPistons and ring sets are availableSee Section 2, SpecificationsNOTE