2003-2006 Kawasaki KFX400 service manual, Page 158Get this manual
COOLING AND LUBRICATION SYSTEM
RADIATOR AND HOSES
COOLING CIRCUIT INSPECTION
Before removing the radiator and draining the engine coolant, check the followingCheck the cooling system for leaks with radiator tester Remove the radiator cap and connect the radiator tester to the fillerPressurize the cooling system with 120 kPa (1.2 kgfcm, 17 psi) of pressure, and then check if it holds the pressure for 10 secondsIf the cooling system does not hold the pressure for at least 10 seconds, check the entire cooling system for leaksIf leak is found, replace the damaged part