2003-2006 Kawasaki KFX400 service manual, Page 59Get this manual
PERIODIC MAINTENANCE
Connect the electric tachometer or the multi circuit tester to the high-tension cord Start the engine and set the engine idle speed between 400 and 600 rmin by turning the throttle stop screw Engine idle speed: 500 100 rmin 09900-26006: Tachometer, or 09900-25008: Multi circuit tester set