Depends Steve. 180-220ish. Only time I really had it over heat was when I was messing around in a spot not really moving much and pinning the shit out of the bike for awhile. It spit up some coolant. Let it sit for a few min with the bike off and then back to riding again. Just toped off radiator when I got home. Bike is jetted fat, has chariot water pump kit/impeller over sized radiator and engine ice for coolant. Works good just keep the bike moving if it starts to get too hot and keep the rpms down