Yes I finally have an update from the dealer and the machinist a few days ago. Been busy with hvac problems but that is for another time. Unfortunately it does not sound good. The machinist says that there is no excessive wear. Measurements show consistency for valve stems, heights, seats, buckets. I believe this means that all parts are consistent to each other. He does not see anything that would cause the location of the retainer on the valve to be dropped. Boy, I hope I am saying this right. I could quote but am not sure if that is proper according to site rules, nor would I want to anyways. Unfortunately he does not have factory specifications.
He did find three exhaust guides worn beyond tolerance; all on the air injector side of the cylinder. Something he has seen on other brands.
The dealer spoke with K; they suggested replacing all valve parts on the bad one and see what if anything changes.
We shall see. I'm wondering if the head may end up in K's hands for review or maybe a factory rep coming out to take a look.
I wish I had better news to share with you guys. The mystery continues. In the meantime I have the R100/7 cleaned up and running. Need tags and insurance. Oh yeah one more thing: 100 degree plus temps recently... riding is not on my list of things to do.
Stay tuned.