Red Sonja comes to "normal" temperature, about 175°F in a few minutes. OK. While splitting lanes on my ride home from work in SF Bay Area traffic it will jump to 200°F-210°F. OK. Once I get up to 75-80mph the temp. won't drop below 190°F. Recently would not fall below 210°F. Since I bought the bike about 18 months ago, this is a new problem. I checked coolant level and all is perfect and the fan comes on at about 215°F. Might the t-stat be frozen just barely open, not allowing proper flow? If so, what's the procedure for t-stat replacement. I don't have a manual to refer to since the place of purchase didn't have one to give me. Any assistance or recommendations would be greatly appreciated.