Fan Switch:
Lower Temperature Actuation

Note - this is mostly for carbed bikes - newer EFI bike can often be reflashed.

While cruising down the highway, autobahn, interstate or operating your bike at moderate speeds, the stock cooling system on most all current bikes will keep engine coolant temperature under control.

Under control, means below 212f / 100c and above 76c.

Most stock engined sportbikes produce maximum power between 92c and 96c coolant temp.
The lower end of that window is controlled by the thermostat. The upper end in the cooling system's ability to shed heat.

Problems occur, though, when the bike is operated in town, in stop and go traffic on hot days. There is insufficient air going through the radiator to remove the excess heat.

The stock auxiliary cooling fans turn on commonly at ~100c/212f, adding some airflow and cooling.

That's too hot for most bikes to even run properly in town. Both TL 1000's and RC51's are VERY sensitive to temperatures over 100c - running very poorly at part throttle when hot.
When the coolant temp reaches a particular level, the fuel injected bikes will then begin to tune themselves into "self preservation mode". regardless of whether there's a mechanical problem or it's just that a racebike is being used in an extreme environment - like idling in traffic on a 100f day!
TL1000's, as a typical, normal, everyday example, get rich and lumpy at 202f to 203f. You can feel the engine change it's running characteristics as you sit there - and you can tell that it's reached that coolant temperature by the way that it idles, even.
The TL, I only used as an example - every stock ECU that I've ever tested does the same thing at some temperature. 

Changing  the stock thermostatically controlled fan switch to a new switch that completes the contact at a lower temperature will start cooling  the engine earlier and help prevent overheating when in town.

Now........  Do I know all the part numbers?    Nope.

You'll have to do some parts matching up from auto supply.

Look up your fan switch temperature in the service manual and then locate a similar construction fan switch for a car that works at a lower temperature.

The sensors are pretty common.

DON'T call me or email me and ask where to get a lower temp. fan switch for your bike - It's up to you to find it yourself.
|If you do the research and installation and you have part numbers, thread pitch and diameter of the fan switch threads, I'll post the information and give you credit for the research, though!

Good luck!