2003-2006 Kawasaki KFX400 service manual, Page 62Get this manual
PERIODIC MAINTENANCE
Install the radiator cap securely After warming up and cooling down the engine, add engine coolant until the level is between the upper and lower lines on the engine coolant reservoirRepeat the above procedure several times and make sure the radiator is filled with engine coolant to the upper line of the engine coolant reservoirEngine coolant capacity (including reserve): 150 ml (1.2 US qt, 1.0 lmp qt)