when i drive in the city my 954 starts to overheat in traffic lights, so I think to mount a second fan will shoot and will let you see what happened.
Last year I placed second unoriginal but I had a problem with the attachment and remove it but now I have found the original , installation have it prepared for it only remains to remove the radiator and wel stiffening plates

 

just mount a switch to turn the fan on

 

I recently installed a fan switch. Bike used to get up to around 205-210 at the drag strip on the return road after each run and if next run was only a few minutes the bike would be close to the fan kicking on at the start of the run.

With the switch installed and on my bike never got over 185 all night.

 

I have one but it does not help much in my town from stoplight to stoplight no more than 300-500 meters and motor up over 103 degrees even with the fan running

 

the problems with two fans are: a) the extra draw on the electrical system b) it's going to be hard to weld brackets to the radiator without blowing a hole in it.

because believe me, i've thought about doing it. i still might try it...