2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 96Get this manual
CHECKING THE COOLANT LEVEL CHANGING THE COOLANT EBS00076
CHECKING THE COOLANT LEVEL 1Place the machine on level surface2Check: coolant level The coolant level should be between the minimum level mark and maximum level mark bBelow the minimum level mark Add the recommended coolant to the proper levelCAUTION:
Adding water instead of coolant lowers the antifreeze content of the coolantIf water is used instead of coolant, check and if necessary, correct the antifreeze concentration of the coolant Use only distilled waterHowever, soft water may be used if distilled water is not available4Start the engine, warm it up for several minutes, and then turn it off5Check: coolant level NOTE: Before checking the coolant level, wait few minutes until the coolant has settled_