Thanks for the quick response! I live in Seattle and ride in the Olympic and Cascade Mountains. Mainly forest service roads at slow to medium speeds and the temperatures will be between 45 and 85 degrees F. I'm recovering from a bad fall which resulted in a badly broken ankle last summer so I plan to do a gravel and pave road tour to Northeastern WA (Lake Roosevelt) via the Cascade HWY (Winthrop, Omak) as part of my "rehab" next month (mid June).
My DR650 is a 2004 with about 7000 miles. It's pretty cold blooded and usually runs cool (it's only gotten noticeably hot once on a slow steep rocky road while we were searching for a lost GoPro camera).