2008-2010 Kawasaki KFX450R Factory Service Manual, Page 114Get this manual
FUEL SYSTEM (DFI) 3-57 Fuel Injector (Service Code 41)
Audible Inspection
Start the engine.a screwdriver [A] to the injector [B]Put of Apply the tiponto your ear, and listen whether the injector the grip end
is clicking or notA sound scope [C] can also be usedDo the same for the other injectorsIf all the injectors click at regular intervals, the injectors are goodThe trouble may be related to the fuel line, requiring fuel pressure inspection (see Fuel Pressure Inspection)The click interval becomes shorter as the engine speed risesIf any injector(s) doesn't click, the DFI circuit or the injector is suspectPerform "Fuel Injector Power Source Voltage Inspection", first
Fuel Injector Power Source Voltage Inspection
tor connector
connector Disconnect the injector[B] between[A] and connect the insulated auxiliary leads injector [C] and injec-