Fogging a 90HP Mercury 4-stroke

[Georooney]

I'm winterizing my 90HP Mercury 4-stroke. Instructions say to spray fogging oil in the carb intakes; problem is that there's an airbox ahead of the carbs, and half of what I spray into it ends up lying on the bottom. Is there a way to get the fogging oil where it's supposed to go?

I tried using a longer spray tube from the can, but it's hard to feed the tube in through the airbox and hit the intakes, and by the time I get to the second one the first cylinder has burned up the oil.

I've even thought about drilling and tapping 4 holes in the airbox in line with the 4 carb intakes, but don't want to mess things up.

Any suggestions?

BTW, hope I don't get shot for posting in two forums......

 

[CharlieZulu]

Re: Fogging a 90HP Mercury 4-stroke

My air box is a pain to remove, so I just sprayed right into the six intakes on the port side of the air box with the engine at idle. Stuff gets sucked right in, I didn't see it going anywhere else. 1987 Merc 3-cyl 90hp.

Funny thing though, my engine never quit although she did fog quite a bit. (The neighbours were wondering what was going on!)

 

[Georooney]

Re: Fogging a 90HP Mercury 4-stroke

Ditto with my motor; it coughs and sputters and sends out a smoke screen but doesn't die, which makes me think I'm not getting enough of the fogging oil into the cylinders.

I did pull the spark plugs after I shut it down, and squirted some of the stuff in each cylinder and then turned the motor over a few times by hand. I guess that should do the trick?

As a new boater, I'm learning the hard way about winter maintenance. I didn't exercise the steering over the winter, and found it was seized tight by spring.