1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Manual, P/N 507263, Page 147Get this manual
Cleaning
INote Before
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 wallsUse slow RPM to achieve strong "crosshatch" pattern for best oil retention and ring sealing
INote To
avoid piston or cylinder block damage, restore the chamfer to all port edges using ball hone or other suitable toolTo avoid personal injury, wear eye protection and rubber gloves when using OMC Gel Seal and Gasket Remover
11!1 4Use OMC
Gel Seal and Gasket Remover to remove all traces of gaskets, adhesives, and OMC Gel-Sealfrom the cylinder block and crankcase5Carefully remove any carbon accumulation from the tops and ring grooves of the pistonA ring groove cleaning tool can be made by breaking an old ring and grinding an angle on its end[}o not damage ring grooves while cleaning6Thoroughly wash entire cylinder block and crankcase with warm, soapy water to remove all traces of contaminants