1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 116Get this manual

1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 116

8Inspect valves for contamination, excessive wear, or damagePay particular attention to the valve seat face, replace if
oversize, or tapered conditionBe sure the gauge or micrometer is perfectly square in the bore when measuring13Measure each
cylinder in at least two areasMeasure each area twiceThe difference between the two measurements in each area is the cylinder
out-of-round dimensionThe cylinder must not be out of round by more than 0.003 in(0,08 mm)14The difference between the two
areas is the cylinder taperThe cylinder taper must not exceed 0.002 in(0,05 mm)15The difference between your measurements
and standard bore dimension is cylinder oversizeRefer to Engine SpecificationsSection 1, for dimensionsThe cylinder must
not be oversize by more than 0.002 in(0,05 mm) INote If any cylinder is outside these tolerances, it must be bored oversizeOne