1993 Johnson Evinrude "ET" 9.9 thru 30 Service Repair Manual, P/N 508282, Page 154Get this manual
Quality of the image is intentionally reduced!
1 19 Measue the piston in two locations, 900 apart from each 22 other, 18 in(3 above the bottom of the piston skirt10 The difference between the two measuements is the out-ofroundness and must than 0.