1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 167Get this manual
Cleaning
1 1Before Note
inspecting or assembling powerhead, all internal components must be perfectly clean and free of contaminants1Remove any carbon accumulation from exhaust port areas
2Remove any carbon accumulation from cylinder head combustion chambers3If cylinder walls are glazed from extended use, use medium grit hone to resurface walls Use slow RPM to achieve strong "crosshatch" pattern for best oil retention and ring sealing
r;:J To avoid piston or cylinder block damage, restore the chamfer
to all port edges using ball hone or other suitable tool
ill gloves when using OMC Gel Seal and Gasket Remover1371 4Use OMC Gel Seal and Gasket Remover to remove all
b To avoid personal injury, wear eye protection and rubber