2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 215Get this manual
POWERHEAD INSPECTION the cylinderUse feeler gauge to measure the ring end gap
Bearings
Inspect center main bearings and split sleeves for excess wear, nicks, or scratchesReplace if necessary
Ring End Gap Specification Standard or Oversize rings 0.011 to 0.023 in(0.28 to 0.58 mm)