Fogging an outboard motor

[coveman]

The general rule appears to be that it is worth fogging an outboard before winter storage in order to keep the components lubricated and protected. The method I have seen used is to spray the fogging agent into the carb intake until the engine stops. It is then put away in storage. However, I have always run the engine until the fuel runs out and so the engine cannot be running when fogging. Is it best to fog the engine as it is about to run out of fuel or is it sufficient to squirt a bit of fogging agent into the plug hole?

 

[Dellquay13]

fog the engine til it stops then drain the carb bowl with the drain screw? Then squirt some fog into the spark plug hole.

 

[VicS]

The "best" is probably to fog it while running until it stalls then drain the carb, but not all carbs can be drained easily. My Evinrude does not even have a drain plug on its carb and it would be a job and a half to remove it to drain it.

I , in fact, fog it and leave it. Been doing that regularly since 1985 with no problems but I think with E10 petrol I will fog it but keep it running until it runs out of fuel then spray a bit more oil in via the plug hole.

Perhaps use an oiler fuel mix, especially if normally using 100: 1 for the final run before laying up??

BTW I use 2 stroke oil in a trigger spray bottle rather than buying expensive aerosol cans of fogging oil .... suggested by my local outboard guy.

 

[Dellquay13]

if your motor is electric start, you can run it dry of fuel til it stalls, open the throttle wide and fog it down the carb throat while turning the engine on the starter.

 

[coveman]

The "best" is probably to fog it while running until it stalls then drain the carb, but not all carbs can be drained easily. My Evinrude does not even have a drain plug on its carb and it would be a job and a half to remove it to drain it.

I , in fact, fog it and leave it. Been doing that regularly since 1985 with no problems but I think with E10 petrol I will fog it but keep it running until it runs out of fuel then spray a bit more oil in via the plug hole.

Perhaps use an oiler fuel mix, especially if normally using 100: 1 for the final run before laying up??

BTW I use 2 stroke oil in a trigger spray bottle rather than buying expensive aerosol cans of fogging oil .... suggested by my local outboard guy.

Yes , I am in the same position in that the carb on my Yamaha 8hp 2 stroke has a drain plug, but totally inaccessible! I think I will follow your tried and tested method - thanks

 

[Steve65]

if your motor is electric start, you can run it dry of fuel til it stalls, take the spark leads off, open the throttle wide and fog it down the carb throat while turning the engine on
Be careful doing this if you have a CDI fitted....make sure kill cord is disconnected. If no kill cord mske sure plugs are connected and grounded or you stand a good chance of blowing the cdi unit