Below is great info from a personal friend of mine on the 600rr forum (Tenjin). Although it applies specifically to a 600rr...it can be assumed that it is likely the same for a 1000rr..hope this helps: This data, as far as i can tell, applies for ALL years of the Honda 600RR for imperial measurement (U.S.) the temp gauge starts reading at 98f the thermostat STARTS to open @ 176f the thermostat should be fully open @ 183f the fan turns on when the bike reaches 220f, and continue to operate until the bike is brought down to 200f the fan will still operate if the motor is off, key in ignition, and ignition is on, and the bike temp is over 220f, and it will continue to still operate until the coolant in the system is brought down to 200f operation of the bike to the 240 - 250F range is acceptable, how ever this is the range where you would want to find a safe place to park Metric the temp gauge starts reading at 36C the thermostat STARTS to open @ 80C the thermostat should be fully open @ 84C the fan turns on when the bike reaches 104C, and continue to operate until the bike is brought down to 93C the fan will still operate if the motor is off, key in ignition, and ignition is on, and the bike temp is over 104C, and it will continue to still operate until the coolant in the system is brought down to 93c operation of the bike to the 115 - 221C range is acceptable, how ever this is the range where you would want to find a safe place to park =-=-=-= The standard mix of Coolant (ethylene glycol - with corrosion protection inhibitors) is a 50%/50% mix of cooland and distilled (soft) water The radiator and engine contains 3.2 Liters (or 3.4 US Quarts) the Reserve tank contains .3 Liters (or .32 quarts) the radiator pressure limits are 108-137 kPa (or 16-20 PSI) .. note, this is the pressure range where coolant should be switching to the reserve tank as an over flow the thermostat as from start to open to full open should have an 8mm lift (the valve moves 8mm from full closed, to full open) to sum things up... any thing below 250F or 121ish C is NORMAL 250 is flat out the over heat point it is not uncommon for the bikes to get to 240F or 115C