1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 38Get 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 OMC 2+4 fuel conditionerAdd one ounce of OMC 2+4 fuel conditioner for every gallon of gasolineUse flushing attachment if you operate the engine on trailer or dolly to prevent engine or water pump damageengine's propeller before starting engine to prevent accidental contact with moving propeller
JWhen using flushing attachment, always remove
2Run 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 fuel3Prepare an engine "storage mixture" in shop V6, six-gallon tank PIN 397767The mixture should include: Five Two One One