Join Date: Feb 2010
Location: Narragansett Bay
Thanked 593 Times in 569 Posts
Rep Power: 12
If carbonized, I would have thought there was too much oil (which is what your ratios suggest too). This should not have scored the cylinders. Confusing scenario.
Was the engine fogged before it sat in the humid climate for a season. Hard to do, if fuel is run dry.
Anyway, I hate mixing fuel. I'll take a four stroke any day. Our current Yamaha 9.9 has been terrific. Nothing more than pre and post season maintenance, fill the tank and go. Yamaha says not to drain fuel, rather just fog with their fogging oil, until you choke it out. Obviously, this impacts the fuel in the bowl too.
I've had Mercurys and Tohatsus that were fine. Weird little problems, but nothing that would cause me to steer clear. At the end of life (10 years) on my last Tohatsu 18, one of the cylinders lost compression, but it still started and ran okay. Got me home. That's what really matters.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.