If you're running a first-generation Yamaha F225 four-stroke outboard — or any of the engines built alongside it in the early 2000s — this video explains why that motor may be silently destroying itself from the inside out, and why most owners never see it coming until it's too late. The problem isn't saltwater, isn't ethanol, and isn't neglect. It's a design flaw in the dry exhaust passage running through the midsection, where hot combustion gases corrode the aluminium castings from the inside, often breaching into the oil pan and water jacket. BoatUS documented dozens of owner reports pointing to the same failure, typically occurring between 500 and 700 hours — well past the three-year warranty window. This video walks through the four stages of failure, the symptoms to watch for, a step-by-step diagnostic procedure you can run yourself, what repairs realistically cost versus a full repower, and what a federal appeals court found when owners tried to hold the manufacturer accountable. The Evinrude E-TEC discontinuation and its orphaned-engine problem is also covered in full.

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