I rode a Vulcan900 for 10 years so I'm used to a water cooled bike, but when I got my Vaquero I was immediately surprised by how much heat the 1700 generates. The 900 does not have a temp gage so I don't know how much fluctuation is normal for this engine. In my car the gage quickly settles just below the1/2 mark and stays there. On the Vaquero the gage never seems to settle. Riding in 70F weather it hangs around the 1/4 mark, but stop for a red light and it's near the Hot mark by the time the light turns green. The fan comes on and it's never gone into the red, but I'm curious about other's experience.