During my testing, I discovered the fan on my bike (XTX) turns on at around 105C as I watched the temperature reading increase on my PCV software.
The 'switch' you pulled out, where did it come from?
Was is on the right side of the bike, same sort of height as the TPS on the back side of the cylinder and made of brass?
http://4.bp.blogspot.com/_vE1-EGFNds...660+Engine.jpg
At the top of that pic, in the middle.
If its what im thinking of its the temperature sensor.
As it heats up, the voltage across it drops so what you can do it put a multimeter across the 2 pins on it and measure the resistance.
It should be around the 2000 ohms mark at 20C and about 180 ohms at 100C