Had a thermostat from an Aprillia 1000 installed with normal operating temperature of about 85 centigrade.

I recently fitted NOS thermostat which was genuine ducati 851 and this has a normal operating temperature when driven of 75 centigrade with an air temperature of 7.5 centigrade. The bike when standing will reach 88 centigrade before the fan starts.

This driving temperature seems too low, or is it normal for the 907?

The nominal and generally accepted normal operating range for any IC engine is 85 to 90.5C(185-195F)
Now since we are talking about a bike with a small capacity for heat exchange the closer to the low end the better off you will be

BTW, the 906 and the supplement to it for the 907 manuals are here in the downloads section

Thanks for the info.

Not sure about ECU and such. My bike runs a simple thermoswitch for the fan which is independant of ECU operation.

I think I will run the bike for a while and see how it goes. Running too cool or too hot can lead to trouble but I get the impression that the bike prefers being cool to being hot.