By the way... just as a follow-up, I wanted to mention that I did find the Valvoline 20-50 Motorcycle Oil at Advance. I put it in on Saturday and ran it in for about a half hour before the skies darkened, but the bike seemed to like it, aside from the usual hide and go seek with neutral when at op temp.
I did notice a bit of what seems to be a top-end whine when the engine is warm, but I can't swear that this is really an entirely new thing. After having read all of the related topics on various engine noises, I'll have to check my timing chain adjustment again. I had it seemingly correct the last time (about 1mm movement of the plunger when warm ((not hot, though)), and I have plenty of room left on the adjuster, as I recall. I did the valves very few miles ago. So, I'll have to keep an eye/ear on it... I'm going to try to get a few fun miles on the bike this season.
Anyway, not to digress from the original poster's topic... just mainly wanted to follow up on the oil search. I'll try to report on how it goes.
TC