Don't take my response the wrong way. I appreciate your response and I will go home and look at the wheels to see if maybe a weight has come off. Hopefully there will be a mark if it did and I will be able to see it. But washing the wheels didn't make it happen. :-)

This vibration is winning this fight right now. I am temped to drain the primary for the BelRay and go back to 20W-50 in the primary just to see. I don't see how that could be the issue. But you never know. I can't find anything else so...
I am also beginning to wonder about the tires. Both tires LOOK good. The rear, a Dunlop American Elite (I think) has about 15,000 miles on it. The front is original with 26,000 on it. I have looked at them, but maybe something in going on I can't see.

Thanks again

 

Pull the wheels and have them rebalanced.

 

26k on a factory tire? Holy ****, that's amazing! Run your hand along the tire in both directions. If you can feel the edges of the tread then you have cupping that can cause a vibration.

 

When you did your service did you pull the right muffler or mess with the exhaust in any way?

 

 

There is no way you have that kind of mileage on your tires. I want to see a pic of these tires