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I bought my boat in May 2005 and the carbs had to be rebuilt/and unclogged 2 times (Yam. 40hp 4 stroke) due to water induced white crap which was corrosion, I tried Stabul and it worked a little but still didn't keep the moisture from messing up the carbs Yamaha suggested an enzyme stabilizer.
You can do a search for the whole story using ethanol as the search word.
I'm sold on the Star Tron / Ring free thing, I use one oz. per ten gallons... Of course a good water fuel seperating filter like a Raycor with a ten micron element is also a must.
With me it's not a guess it's the facts.
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