1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 213Get this manual
16The difference between your measurements and standard bore dimension is cylinder oversizeRefer to Engine Specificatjons, Section 1, for dimensionsThe cylinder must not be oversize by more than 0.002 in(0,05 mm) Notel
If the cylinder is outside these tolerances, it must be bored oversizeOne oversize piston is available for this engine 0.030 in(0,762 mm)To determine oversize bore, add 0.030 in(0,762 mm) to the standard boreRefer to Engine Specifications, Section 1
17Place the top two rings of the piston, separately, in the cylinder boreUse piston to square the ring in the cylinderUse feeler gauge to measure the ring end gap The ring gap must be within 0.0060.014 in(O,15 0,35 mm)
18Use feeler gauge to check groove side clearance on the top two ringsInstall rings on pistonWith the ring seated in its groove, make several checks around the pistonThe side clearance must not exceed 0.004 in(0,10 mm)