1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 26Get this manual
Off-Season Storage Use the following procedure to properly prepare Johnson and Evinrude outboards for extended periods of nonuseThese steps are intended to protect the engine during storage and simplify the preseason servicing procedure1Stabilize the engine's fuel supply with OMC4fuel conditionerAdd one ounce of OMCfuel conditioner for every gallon of gasoline
INote Use flushing attachment if you operate the engine on a
trailer or dolly to prevent engine or water pump damage
When using flushing attachment, always remove engine's propeller before starting engine to prevent accidental contact with moving propeller2Run the engine at approximately 1500 RPM for five minutes to ensure that the entire fuel supply system and the engine's carburetors are full of stabilized fuel
3Clean internal engine components by spraying OMC Engine Tuner into the carburetor's air intakeRun the engine as directed to clear the tuner4Fog the engine by spraying OMC Storage Fogging Oil into the carburetor's air intake5Shut off the engineDrain the crankcase and refill with new Evinrudel Johnson Ultra 4-Stroke Crankcase OilReplace the oil filter6Stop engine and remove all spark plugsSpray liberal amount of OMC Storage Fogging Oil into the spark plug holes7Turn flywheel in clockwise direction to distribute the fogging oil throughout the cylindersInstall and torque the spark plugs