Thanks for pointing that out. When I think about it, I suppose they're all going to do produce heat, aren't they? I mean they're internal-combustion engines; they burning/exploding stuff less than a foot beneath me and just a few inches beside either leg.
The three bikes around which I have circled are the new BMW Grand America, the Gold Wing, and the SVTC. I quickly eliminated the SVTC, put off by the early heat reports. My FJR experience, which is otherwise very positive, has me leery of the heat reported in early SVTC reviews. The FJR can get very hot; even when moving quickly on a hot/humid day, the heat coming off it can be very unpleasant.
We quickly eliminated the BMW after riding it. Even in Touring mode the ride is stiff and jiggly, far more of a sport bike than a touring bike. (The K1600 GTL is too high for my wife's arthritic knees, and the seating is too cramped for us.) BMWs are, in an odd way, too sophisticated. I think of them as over-engineered. Plus their reputation is not good maintenance-wise, and BMW doesn't stand behind its products the way Yamaha does. The Gold Wing and SVTC are also sophisticated machines, but, and I don't know how exactly to quantify this, they are not "overly sophisticated" the way the BMW is, and that, to me, is a good thing.
The touring-mode ride on the new Gold Wing, and the ride is the main criteria for this purchase, is amazingly supple. Bumps from street irregularities are still there, but they are distant, cushioned, more like echoes of bumps. Yet I'm repeatedly drawn back to the SVTC because of my very positive experience with Yamaha over the decades, first on a 2-stroke 350 in the early 70s, then on an XS750 triple, then after 11 years on the FJR/AE (the AE is the designation for the auto-clutch), which, aside from the heat issue, is to my money the greatest all-around street motorcycle ever created.
I have a test ride scheduled for Saturday in Pasadena on the SVTC. It should be a hot day, and there should be traffic on the 110 that we can sit in. And as I write this I realize how perverted that sounds: On a test ride I will be seeking out traffic to sit in.