Since I was replacing my alternator stator (see my other thread), I decided to go ahead and do a full service, including valves.
While I had everything off, I decided to seriously check out the radiator fan. In the 2+ years I've had my Versys, I have never heard the fan come on. When I was adjusting the valves last year, I noticed the radiator fan made a grinding noise when I spun it. At that time I decided ignorance is bliss, since I rarely drive in hot weather or in urban traffic.
But this time, knowing I was planning a cross country trip next year, I decided to check it out. I disconnected the lead and applied battery power to the fan. Nothing.
So, I went about taking it out and checking it out. I took the motor apart, and it didn't look so good inside. I figured it was done.
I priced new fans on various sites. Generally, $300-350. I went on ebay and found no Versys fans. So I looked for Ninja 650 fans. There were many ranging from $4 and up.
I looked at the various listings and deduced that from 2008 up, the Ninja 650 had the same fan as my Versys. 2007 and earlier had a fan with a larger motor.
I settled on a 2007 fan for $35. I figured that since my fan had failed, and there was a different design with a larger motor from earlier bikes, I'd give it a try. Besides, it was $20 cheaper than the cheapest newer-style fan.
I was concerned about any difference in fitment, but I discovered it was a direct bolt-up, connect-up replacement. The new (to me) fan had more reinforced brackets and was about 1/4 inch thicker. I suspect it was a little heavier, but I didn't weight them.
I can't speak about any year model other than my 2008 Versys, but this was a very successful transplant!
In the picture, the Ninja fan is on the left and the Versys fan is on the right.