I doubt they would want to pick holes in your Yoshi as they are without a doubt world leaders in this technology. What exhausts do they fit to their Ninjas I dont think they are kawasaki brand?I did not see any kind of overheating on the temp gauge. My bike runs hot but never reaches the top bar. Also I was traveling consistently on the highway which usually keeps it cool.
Worth noting that on Monday it was a heat wave. Air was humid and warm. That should not be enough to seize an engine though.
Because I have the yoshimura Alpha exhaust, they are telling me that if there is any link to the exhaust in the failure, they won't cover it under warranty. I am still waiting for a diagnostic and will update soon.