I own a 50hp 4-stroke Mariner. First time winterizing it myself so I have a couple of questions.

First, the fogging spray I bought tells me to spray into the carb until the engine stalls. What makes the engine stall? The fog oil? I'm thinking the engine will just keep running.

I tried to remove the plugs to spray into the cylinders but could not find a socke to fit. My 5/8 inch socket is too small but my 13/16 inch won't fit into the recess so I don't know if it's the right size. Can anyone confirm that 13/16 is correct and if so, do I need some sort of thin-wall socket?

Check with your owner's manual!. I have a 2001 50 hp Mercury four stroke. The service manager at the marina where I bought it said that Mercury told him to never fog these motors. Apparently the fogging oil base is too thick and does not allow the valves to seat for a while after start up, causing damage to the valves. This is a problem in 4 stroke outboards since they run cooler than other 4 strokes. Last year the dealer mixed up a special brew of gas, 2 stroke oil and stabil to run the motor on before storage. This year I contacted Mercury directly. The service rep told me to not fog the motor or run the mixture through the carbs. He said to follow the directions in the owner's manual, since their recommendation is based on much testing. The manual recommends simply putting a small amount of motor oil in each cylinder and turning the motor over by hand to coat the cylinder walls (plus the usual: stabil in the gas, changing the oils, etc.)
RCS