Re: Mercury 90HP 2 stroke, 2001 winterizing
The very first step is to add a fuel system treatment such as Sea Foam or Stabil to the fuel. Then connect the flusher, turn on the water and run the engine until you are certain the treated fuel has had a chance to find its way into the engine. A 5 to 10 minute run would suffice. Next, change the lower unit lube. Start the engine and then fog it. Spray the fogging oil into the air intake ports until the engine dies. Remove the plugs and give each cylinder an additiional shot. Install the plugs. Remove the flusher. Leave the engine down so all water can drain. Outboards are self draining as long as they sit perfectly vertical. Put a good coat of wax on the engine, like you would your car, cover it if you wish and you are done. You can change fuel filters now or in the spring when you refire the engine. After the engine is run in the spring, you might install new plugs but it's not necessary unless they are well used.
