Fogging a 2012 Yamaha F350

Yamama04107

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Anyone have any experience in doing this? I'm looking for a way to do it with a spray can of fogging oil and not a portable gas tank mixed with fogging oil.
 
Why would you want to do it in a manner that is not recommended by Yamaha?
For the simple reason that I did not own a small portable fuel tank and was looking for a cheaper solution. $114 later and I now do and have completed the project by disconnecting the fuel in line on the water separator and connecting the tank.
 
There's a reason behind their madness (and it's the same for all manufacturer's) and I guess you didn't know about this. If you fog a newer engine with lot's of sensors, by using fogging oil, you risk fouling the sensors.

The other way you could have done it was to simply add the right amount of 2-stroke oil and stabilizer to the engine mounted fuel/water separator and run the engine for a pre-determined amount of time.

By the way, did you pump some antifreeze through the block? Correct me if I'm wrong, but I think those 350's have at least one very small water passageway that has been known to clog up.... thereby retaining water in the block.
 
By the way, did you pump some antifreeze through the block? Correct me if I'm wrong, but I think those 350's have at least one very small water passageway that has been known to clog up.... thereby retaining water in the block.

^^^THIS!

Easy to do both at the same time. Run the engine to fog it opening up the thermostat. A "Run Bag" makes life easier. Shut it down and, with a small portable electric pump, pump 2 gallons of antifreeze into the flushing port. As an added precaution, leave the engines down.

To the OP - By hooking up the portable tank at the water separator, it would take a while for the fogging mixture to reach the cylinders. Those 350s don't burn fuel that fast at Idle. Better to hook it up to the engine. Better yet, use the bulb to pump the non-treated gas out out your VST drain. About a half gallon. That way, as soon as you start up, you're burning the fogging mixture.
 
Agree - definitely drain the VST, first. I assume that would have been in the service manual... but one never knows. Draining the VST is pretty much a standard practice, anyways, to check fuel quality and for sediment.

Slightly different, but quite similar... Mercruiser recommendation is 5 minutes at 1200RPMs. 10 minutes with a VST tank (not drained). Just to show the time difference, anyways.