1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 178Get this manual
f19l 6Remove all the screws from the cylinder head water cover, tap it around the edge with soft mallet to break the seal, and then remove itRemove the thermostatsealand spring Then, remove the cylinder head 1201 7With number punches, mark the top piston dome "Noand the bottom piston dome "No2"1211 8
Remove the inner and outer exhaust covers; carefully separate the pieces and clean the gasket surfaces