I've just run one of my CX up to idle+.It's hard to get a really accurate figure because of variables.My 85 Deg C reading the heads was on a very warm summer day after a good ride so the whole bike was hot,if you get my drift.Just done some now and my heads,once the fan cuts in,are at 75 Deg C even and the ambient day temps are 16 Deg C.
Before the temp started rising above the nominal mark the bottom of the rad cores was between 60/65 Deg C.After the fan had kicked in and I let it drive down the temps the cooling pipe and rad bottom settled around 65/66 Deg C.
I'll try and remember to do some more after a ride as that will give a better reading of normal use,not just stood idling before a ride.
Thanks, this is exactly the type of information I need and, oddly enough, close to what I expected. In addition it would be nice to know the hottest temp you can read from the radiator at the same time. Might be able to "point and shoot" the upper radiator fins through the grille, bet we're going to find a reading of around 85*
I think you decided that since you've got some air space around your switch the actual water temperature going in would be around 10* or so higher than the 70* switch you're using?