1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Manual, P/N 507263, Page 151Get this manual
6Install piston rings on each pistonTapered ring must be installed in top grooveSpread each ring with ring expander just enough to slip it over the head of the piston and down into place7Coat the piston and cylinder bore with oil[] 8Place the piston in OMC Ring Compressor, PIN 339754, (PIN 339755 for oversize pistons)Make certain that the rings are correctly positioned in their grooves with respect to the dowel pinsDamaged pistons and broken rings may result from imperfect alignment of the ring gap and the dowel pins INote The piston rings must be correctly located on their dowel
pins to prevent permanent powerhead damage[] 9Start the piston into bore of the cylinaer with deflector of the piston (sharp edge) toward intake port side of the cylinder block
INote Loosely
install the cylinder head to prevent the pistons from falling out
10If removed, oil and press new lower main bearing onto the crankshaftWhen pressing on the bearing, support the crankshaft between the two lower counterweights and press against the lettered side ofthe bearingInstall the retaining ring in groove of the crankshaft with sharp edge of the ring facing away from bearing11Oil the upper main bearing surface of the crankshaftSlide the upper main bearing onto the crankshaft with lettered side facing the flywheel end of the crankshaft