This is exactly the range my 85 ASPY runs in....My experience with temperature variablity was due to a bad water pump. The pump was bad when I got the bike last fall, I just didn't know it until water showed up in the oil. The temp then (84 aspy) would run at 7 - 8 bars, no matter what. After changing out the pump it runs mostly at 4-5 bars, 5-6 bars at 90 degF ambient, 80mph on the interstate. Fan comes on just before 6 bars and while sitting at idle temp will stay between 5-6 bars with fan cycling on/off. I'm thinking of doing the same as Tricky and putting a sensor and gauge on it so I'll know the actual temperature.