that's right lilnots - the coolant thermostat opens at 185, that's what allows coolant to circulate through the cylinder and head to the radiator. if the motor is colder than 167degrees, fuel evaporation will suck and the bike would be inefficient.
the fan thermostat they speak of is the switch that turns the fan on.

 

o ok thanx hightower, well i shouldn't have to worry about until next fall, i went for a little ride tonight at it was around 185 and its only gettin warmer here