Yamaha Outboards 3P Service Manual, Page 40Get this manual
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CYLINDER BLOCK Cleaning 1) Using gasket-scraper, remove all traces of gasket material from the cylinder-block surface2) Using soft brush and solvent, clean the cylinder-block
Inspection 1) Visually inspect the cylinder sleeves for cracks and scratchesIf cracks are found, replace the cylinder blockIf scratches are foundcheck the degree of out-of-roundand then hone the cylinder or re-bore it if necessary2) Using cylinder-gaugemeasure the cylinder bore at three positions in the thrust and axial directions