Originally Posted by one2dmax
We usually run a fan override manual switch to turn the fan on earlier to help the radiator control the temp at low speeds. The aftermarket sending units available do this at an earlier temp but typically end up running all the time once warmed up instead of cycling on and off. Not sure how long it would take to wear out the fan motor but most of the time the fan doesn't need to run while you are cruising down the road (unless it's a really hot day).
I can attest to this problem - my max is fitted with a lower temp switch that turns the fan on earlier. As a result, the fan is *always* on once the bike is warmed up (I am in Florida). I fitted a manual fan switch, not to turn the fan on but to actually turn it off - as Sean said when cruising (even on a hot day) there is no need for it as the system copes admirably and keeps the gauge half-way up.
I also noted better mpg with the fan off at highway speeds - I went from 95 to 105 miles from full tank to reserve light after turning the fan off.
Now I wish I could wire up my override switch to the turn signal cancel circuitry, so it automatically comes back on when I'm stopped...