Mine used to, but now doesn't. Checked it out, and all the bits are functional (thermostat and fan) but the activation temp's pretty high- 97 degrees c if memory serves. The only time I can ever remember it coming on was when the bike was sat still and running while I parked it- the airflow seems to do the job when it's moving.
Ah, here's a thought. If your coolant's low, the thermostat is pretty high up the radiator... It might be possible for the level to be below the sensor?
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