Also if you shut the engine off while the fan is running it will continue to run (and will be easier to hear -ie. know for sure that it is running) until is reaches the proper temp (as long as you don't turn the key off)
If yours is kicking in about the middle I would be happy with it and leave it as is. To answer your question though, I picked up a thermo fan switch marketed for an accord/civic (p/n 37760-PB2-003). The first (and last) portion of the part number was the same, so of course it worked without any problem. The middle portion of the part number is just the model designation. The honda motorcycle part number was 37760-MC7-003 which is for the electric fan model CX/GL models.On my 650C i have noticed that my fun will kick on when the temp guage reaches about the middle of the bold white line.. i've never had it get close to the red. This could be just a differance in guages or my thermo switch just kicks the fan on sooner...whatever the case i am happy that it all is working corectly. It does make sense that the hotter the motor runs, the life of the stator will be shortened. How much would a new thermo switch cost????