Turn it off
Turn it OFF. As said before it will just cause you problems. It circulates water around your carb on extremely cold days. On normal rides all it does is cause you sled to shut down from a vapor lock. I am speaking from experience here, had a 600 for my wife that someone had opened the valve on and it kept shutting down. Once it sat for about a half hour it would start back up. We didn't get it figured out till it had been in the shop twice and they couldn't figure it out either. I just noticed it one day, turned it off and no more problems.