1993 Johnson Evinrude "ET" 9.9 thru 30 Service Manual, P/N 508282, Page 176Get this manual
Cleaning nants
Before inspecting or assembling powerhead, all internal components must be perfectly clean and free of contami-
1Remove any carbon accumulation from exhaust port areas2Remove any carbon accumulation from cylinder head combustion chambers
3If cylinder walls are glazed from extended use, use medium grit hone to resurface wallsUse slow RPM to achieve strongcrosshatch" pattern for best oil retention and ring sealingtool
To avoid piston or cylinder block damage, restore the chamfer to all port edges using ball hone or other suitable
ill gloves when using OMC Gel Seal and Gasket Remover
'" To avoid personal injury, wear eye protection and rubber