Well, I have indeed heard of motors
damaged by excess unatomized fuel washing down the cylinder walls and causing the rings to score them deeply, and that was with cast iron blocks -- with an aluminum-silicon block, I would expect the problem to be worse rather than better. On the other hand, the damage hasn't yet been proven to exist; even if there is some, it may be very light and go away again after a long "break-in" period -- I've seen that happen, too, albeit on a farm tractor which flooded its intake system because of a stuck carburator float.
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