2008-2010 Kawasaki KFX450R Factory Service Manual, Page 432Get this manual
16-32 ELECTRICAL SYSTEM Ignition System WARNING
The ignition system produces extremely high voltageDo not touch the spark plug, ignition coil, or spark plug lead while the engine is running, or you could receive severe electrical shock
CAUTION
Do not disconnect the battery cable or any other electrical connections when the ignition switch is on, or while the engine is runningThis is to prevent ECU (Electric Control Unit) damageDo not install the battery backwardsThe negative side is groundedThis is to prevent damage to the ECU (Electric Control Unit)
Spark Plug Removal
(DFI) chapter) Spark Plug Cap [A]
Remove: (see Fuel Tank Removal in the Fuel System Fuel Tank