1996 Johnson/Evinrude Outboards 8 thru 15 Four-Stroke Service Manual, Page 136Get this manual
16Place the top two rings of each piston, separately, in its respective boreUse piston to square the ring in the cylinderUse feeler gauge to measure the ring end gap The ring gap (0,15-0,51 mm)must be within 0.006-0.020 in
17Use feeler gauge to check groove side clearance on the top two ringsInstall rings on piston With the ring seated in its groove, make several checks around the pistonThe side clearance must not exceed 0.004 in(0,10 mm)