The bike has to get pretty hot for the fan to come on.... A switch here in Florida is a must have far as I'm concerned. I use mine all the time at these 5 minute Red Lights..
I'm using a Borg Warner TFS545,can cross over to other numbers too. Comes on at 192-194 deg. Shuts down at 174 deg. Fan is on most of the time with this switch though. Works for me. Just another option for ya O.T. My bike is running just below that black dot on the OEM gauge.
Steve-o