I read your post on another thread were you say the exact same thing.
None of your bikes have sumped, and the next line you proceed to talk about your 18 sumping???
I don't think, based upon the videos, that just backing out of it for a bit, is going to save these M8's.
But I am glad you have had at least 2 that have not sumped yet.
Correct, by the true definition of sumping, the 18 may have not sumped as it did not cause damage. The 18 did appear to start sumping. It lost lots of power, would not accelerate at 70 mph. Rode easy for 10~15 minutes and all was good.
Several who have had more than one bike or motor sump, have all pretty much said, let the bike run easy in a vertical position and it will pull the oil out of the crank case.
I did not stop to do it like they have. I am also very sensitive to how the engine feels, so when it was loosing power I rode very easy. The 18 is the only bike I have ever had that has lost power after 117 mies or so of hard riding.
I believe it was starting to sump, but I may be wrong. Not sure what else would cause it to loose power, and then go back to normal after a little bit.