1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 153Get this manual
Cleaning INotel Before inspecting or assembling powerhead, all internal
components must be perfectly clean and free of contaminants1Remove any carbon accumulation from exhaust port areas2Remove any carbon accumulation from cylinder head combustion chambers3If cylinder walls are glazed from extended use, use medium grit cylinder hone to resurface wallsUse slow RPM to achieve strong "crosshatch" pattern for best oil retention and ring sealing Note To avoid piston or cylinder block damage, restore the
chamfer to all port edges using ball hone or other suitable tool&
To avoid personal injury, wear eye protection and rubber gloves when using 01C Gel Seal and Gasket Remover
4Use 01C Gel Seal and Gasket Remover to remove all traces of gaskets, adhesives, and Gel-Sealfrom the cylinder block and crankcase