1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 186Get this manual
18Coat pistons, rings, cylinders, and OMC Ring Compressor, PIN 326591 (PIN 330223 for oversize), with outboard lubricant 114119Center connecting rod in piston and locate piston rings on
their dowel pinsSlide one piston assembly into the respective cylinder bore while guiding the connecting rod through the blockThe piston rings must be correctly located on their dowel pins to prevent permanent powerhead damage