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My yamaha dealer says I might have been running "cold" and possible that my engine wasn't getting up to temp. causing unburnt fuel in the cylinders to drain past the rings and into the crankcase.
I spent a lot of my last trip at trolling speed...no wake zones...shallows etc. and only one short run at full throttle. Thermostat doesn't appear to be stuck but had some corrosion so changing that out. I flush engine after every trip. Brought them a sample of the oil I drained and they confirmed it had odd color and smell.
I'll add new oil and thermostat and see what happens.
Next trip i'll make sure to run at mostly cruising speed
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