http://www.yamaha-motor.com/outboard...ce_matters.pdf
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Maybe you only have to do this on a yamaha and that is why I have a mercury:biggrin
I always run mine out of gas before pulling out of the water. Been doing it for over 30 years and have never had a carb problem.
SEA FOAM!
One is a stabilizer and one is a cleaner that has stabilizing qualities. The thing I like about seafoam is it is dual purpose and the product as far as I have been able to ascertain is 100 percent safe for the engine...the biggest attribute is helping to keep the plugs,piston head and rings carbon free. It will help to clean the fuel system too..but that to me is a secondary quality. I do not use it every tank. Just occasionally.
I have a work supplied Chevy truck with the 6.0 Vortec. It was a used truck from a rock quarry and those boys rode her hard and put her away wet.When I got it the truck oil pressure was low and the thing had severe lifter clatter on start up. I had always read you could replace a portion of your oil with seafoam and run your engine with it to clean it.Figuring if I did not do something pretty drastic the engine was going to require work soon anyway...I tried the seafoam in the oil cleanup technique.Then replaced the oil. It improved the time to full oil pressure on start up and eliminated 95 percent of the lifter clatter.
This and some other things I have done with it like spraying directly into the carb while running , have convinced me the product is safe to the internal parts of an engine.And using it as a parts cleaner on parts with carbon buildup and watching it dissolve the carbon...I think it helps and will do no harm
I use a mixture of both. Kinda like the special Merc formula.
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all good stuff, good thread,